683b025ade
These are taken directly from the density report from a TS1155 tape drive. (Using mt getdensity) lib/libmt/mtlib.c: Add 3592B5 encrypted/unencrypted density codes, and bpmm/bpi values. The bpmm/bpi values are the same as TS1150, but there are 50% more tracks. usr.bin/mt/mt.1: Add 3592B5 encrypted/unencrypted density codes, bpmm/bpi values and number of tracks. Bump the man page date. MFC after: 3 days Sponsored by: Spectra Logic
633 lines
22 KiB
Groff
633 lines
22 KiB
Groff
.\" Copyright (c) 1981, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)mt.1 8.1 (Berkeley) 6/6/93
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.\" $FreeBSD$
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.\"
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.Dd July 14, 2017
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.Dt MT 1
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.Os
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.Sh NAME
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.Nm mt
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.Nd magnetic tape manipulating program
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.Sh SYNOPSIS
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.Nm
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.Op Fl f Ar tapename
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.Ar command
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.Op Ar count
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.Nm
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.Op Fl f Ar tapename
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.Ar command
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.Ar argument
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to command a magnetic tape drive for operations
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other than reading or writing data.
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.Pp
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The
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.Fl f
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option's
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.Ar tapename
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overrides the
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.Ev TAPE
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environment variable described below.
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.Pp
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The available commands are listed below.
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Only as many
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characters as are required to uniquely identify a command
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need be specified.
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.Pp
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The following commands optionally take a
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.Ar count ,
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which defaults to 1.
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.Bl -tag -width ".Cm erase"
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.It Cm weof
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Write
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.Ar count
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end-of-file (EOF) marks at the current position.
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This returns when the file mark has been written to the media.
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.It Cm weofi
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Write
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.Ar count
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end-of-file (EOF) marks at the current position.
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This returns as soon as the command has been validated by the tape drive.
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.It Cm smk
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Write
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.Ar count
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setmarks at the current position (DDS drives only).
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.It Cm fsf
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Forward space
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.Ar count
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files.
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.It Cm fsr
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Forward space
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.Ar count
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records.
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.It Cm fss
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Forward space
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.Ar count
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setmarks (DDS drives only).
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.It Cm bsf
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Backward space
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.Ar count
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files.
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.It Cm bsr
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Backward space
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.Ar count
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records.
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.It Cm bss
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Backward space
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.Ar count
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setmarks (DDS drives only).
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.It Cm erase
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Erase the tape using a long (often very long) method.
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With a
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.Ar count
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of 0, it will erase the tape using a quick method.
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Operation is not guaranteed if the tape is not at its beginning.
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The tape will be at its beginning upon completion.
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.El
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.Pp
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The following commands ignore
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.Ar count .
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.Bl -tag -width ".Cm geteotmodel"
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.It Cm rdhpos
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Read the hardware block position.
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The block
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number reported is specific for that hardware only.
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With drive data compression especially,
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this position may have more to do with the amount of data
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sent to the drive than the amount of data written to tape.
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Some drives do not support this.
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.It Cm rdspos
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Read the SCSI logical block position.
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This typically is greater than the hardware position
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by the number of end-of-file marks.
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Some drives do not support this.
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.It Cm rewind
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Rewind the tape.
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.It Cm offline , rewoffl
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Rewind the tape and place the drive off line.
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Some drives are never off line.
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.It Cm load
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Load the tape into the drive.
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.It Cm retension
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Re-tension the tape.
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This winds the tape from the current position to the end
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and then to the beginning.
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This sometimes improves subsequent reading and writing,
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particularly for streaming drives.
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Some drives do not support this.
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.It Cm ostatus
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Output status information about the drive.
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For SCSI magnetic tape devices,
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the current operating modes of density, blocksize, and whether compression
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is enabled is reported.
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The current state of the driver (what it thinks that
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it is doing with the device) is reported.
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If the driver knows the relative
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position from BOT (in terms of filemarks and records), it outputs that.
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Note
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that this information is not definitive (only BOT, End of Recorded Media, and
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hardware or SCSI logical block position (if the drive supports such) are
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considered definitive tape positions).
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.Pp
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Also note that this is the old status command, and will be eliminated in
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favor of the new status command (see below) in a future release.
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.It Cm errstat
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Output (and clear) error status information about this device.
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For every normal
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operation (e.g., a read or a write) and every control operation (e.g,, a
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rewind), the driver stores up the last command executed and it is associated
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status and any residual counts (if any).
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This command retrieves and outputs this
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information.
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If possible, this also clears any latched error information.
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.It Cm geteotmodel
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Output the current EOT filemark model.
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The model states how
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many filemarks will be written at close if a tape was being written.
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.It Cm eod , eom
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Wind the tape to the end of the recorded data,
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typically after an EOF mark where another file may be written.
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.It Cm rblim
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Report the block limits of the tape drive, including the minimum and
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maximum block size, and the block granularity if any.
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.El
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.Pp
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The following commands may require an
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.Ar argument .
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.Bl -tag -width ".Cm seteotmodel"
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.It Cm sethpos
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Set the hardware block position.
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The
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.Ar argument
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is a hardware block number to which to position the tape.
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Some drives do not support this.
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.It Cm setspos
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Set the SCSI logical block position.
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The
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.Ar argument
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is a SCSI logical block number to which to position the tape.
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Some drives do not support this.
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.It Cm blocksize
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Set the block size for the drive.
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The
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.Ar argument
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is the number of bytes per block,
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except 0 commands the drive to use variable-length blocks.
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.It Cm seteotmodel
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Set the EOT filemark model to
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.Ar argument
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and output the old and new models.
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Typically this will be 2
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filemarks, but some devices (typically QIC cartridge drives) can
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only write 1 filemark.
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You may only choose a value of
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.Ar 1
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or
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.Ar 2 .
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.It Cm status
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Output status information about the drive.
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For SCSI magnetic tape devices,
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the current operating modes of density, blocksize, and whether compression
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is enabled is reported.
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The current state of the driver (what it thinks that
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it is doing with the device) is reported.
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.Pp
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If the driver knows the relative
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position from BOT (in terms of filemarks and records), it outputs that.
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If the tape drive supports the long form report of the
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.Tn SCSI
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READ POSITION command, the Reported File Number and Reported Record Number
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will be numbers other than -1, and there may be Flags reported as well.
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.Pp
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The BOP flag means that the logical position of the drive is at the
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beginning of the partition.
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.Pp
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The EOP flag means that the logical position of the drive is between Early
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Warning and End of Partition.
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.Pp
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The BPEW flag means that the logical position of the drive is in a
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Programmable Early Warning Zone or on the EOP side of Early Warning.
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.Pp
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Note that the Reported Record Number is the tape block or object number
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relative to the beginning of the partition.
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The Calculated Record Number is the tape block or object number relative
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to the previous file mark.
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.Pp
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Note
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that the Calculated File and Record Numbers are not definitive.
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The Reported File and Record Numbers are definitive, if they are numbers
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other than -1.
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.Bl -tag -width 6n
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.It Fl v
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Print additional status information, such as the maximum supported I/O
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size.
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.It Fl x
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Print all available status data to stdout in XML format.
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.El
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.It Cm getdensity
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Report density support information for the tape drive and any media that is
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loaded.
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Most drives will report at least basic density information similar to that
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reported by
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.Nm status
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command.
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Newer tape drives that conform to the T-10 SSC and newer tape
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specifications may report more detailed information about the types of
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tapes they support and the tape currently in the drive.
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.Bl -tag -width 6n
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.It Fl x
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Print all available density data to stdout in XML format.
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Because density information is currently included in the general status XML
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report used for
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.Nm
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status command, this will be the same XML output via
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.Do
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.Nm
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status
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.Fl x
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.Dc
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.El
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.It Cm param
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Display or set parameters.
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One of
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.Fl l ,
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.Fl s ,
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or
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.Fl x
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must be specified to indicate which operation to perform.
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See
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.Xr sa 4
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for more detailed information on the parameters.
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.Bl -tag -width 8n
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.It Fl l
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List parameters, values and descriptions.
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By default all parameters will be displayed.
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To display a specific parameter, specify the parameter with
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.Fl p .
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.It Fl p Ar name
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Specify the parameter name to list (with
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.Fl l )
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or set (with
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.Fl s ) .
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.It Fl q
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Enable quiet mode for parameter listing.
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This will suppress printing of parameter descriptions.
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.It Fl s Ar value
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Specify the parameter value to set.
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The general type of this argument (integer, unsigned integer, string) is
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determined by the type of the variable indicated by the
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.Xr sa 4
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driver.
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More detailed argument checking is done by the
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.Xr sa 4
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driver.
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.It Fl x
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Print out all parameter information in XML format.
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.El
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.It Cm protect
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Display or set drive protection parameters.
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This is used to control checking and reporting a per-block checksum for
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tape drives that support it.
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Some drives may only support some parameters.
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.Bl -tag -width 8n
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.It Fl b Ar 0|1
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Set the Recover Buffered Data Protected bit.
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If set, this indicates that checksums are transferred with the logical
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blocks transferred by the RECOVERED BUFFERED DATA
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.Tn SCSI
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command.
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.It Fl d
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Disable all protection information settings.
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.It Fl e
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Enable all protection information settings.
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The default protection method used is Reed-Solomon CRC (protection method
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1), as specified in ECMA-319.
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The default protection information length used with Reed-Solomon CRC is
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4 bytes.
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To enable all settings except one more more settings, specify the
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.Fl e
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argument and then explicitly disable settings that you do not wish to
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enable.
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For example, specifying
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.Fl e
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.Fl w Ar 0
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will enable all settings except for LBP_W.
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.It Fl l
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List available protection parmeters and their current settings.
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.It Fl L Ar len
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Set the length of the protection information in bytes.
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For Reed-Solomon CRC, the protection information length should be 4 bytes.
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.It Fl m Ar num
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Specify the numeric value for the protection method.
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The numeric value for Reed-Solomon CRC is 1.
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.It Fl r Ar 0|1
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Set the LBP_R parameter.
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When set, this indicates that each block read from the tape drive will
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have a checksum at the end.
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.It Fl v
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Enable verbose mode for parameter listing.
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This will include descriptions of each parameter.
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.It Fl w Ar 0|1
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Set the LBP_W parameter.
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When set, this indicates that each block written to the tape drive will have
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a checksum at the end.
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The drive will verify the checksum before writing the block to tape.
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.El
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.It Cm locate
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Set the tape drive's logical position.
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One of
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.Fl b ,
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.Fl e ,
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.Fl f ,
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or
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.Fl s
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must be specified to indicate the type of position.
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If the partition number is specified, the drive will first relocate to the
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given partition (if it exists) and then to the position indicated within
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that partition.
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If the partition number is not specified, the drive will relocate to the
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given position within the current partition.
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.Bl -tag -width 14n
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.It Fl b Ar block_addr
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Relocate to the given tape block or logical object identifier.
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Note that the block number is the Reported Record Number that is relative
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to the beginning of the partition (or beginning of tape).
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.It Fl e
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Relocate to the end of data.
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.It Fl f Ar fileno
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Relocate to the given file number.
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.It Fl p Ar partition
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Specify the partition to change to.
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.It Fl s Ar setmark
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Relocate to the given set mark.
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.El
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.It Cm comp
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Set the drive's compression mode.
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The non-numeric values of
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.Ar argument
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are:
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.Pp
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.Bl -tag -width 9n -compact
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.It off
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Turn compression off.
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.It on
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Turn compression on.
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.It none
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Same as
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.Ar off .
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.It enable
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Same as
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.Ar on .
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.It IDRC
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IBM Improved Data Recording Capability compression (0x10).
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.It DCLZ
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DCLZ compression algorithm (0x20).
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.El
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.Pp
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In addition to the above recognized compression keywords, the user can
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supply a numeric compression algorithm for the drive to use.
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In most
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cases, simply turning the compression
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.Sq on
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will have the desired effect of enabling the default compression algorithm
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supported by the drive.
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If this is not the case (see the
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.Cm status
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display to see which compression algorithm is currently in use), the user
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can manually specify one of the supported compression keywords (above), or
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supply a numeric compression value from the drive's specifications.
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.Pp
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Note that for some older tape drives (for example the Exabyte 8200 and 8500
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series drives) it is necessary to switch to a different density to tell the
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drive to record data in its compressed format.
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If the user attempts to turn compression on while the uncompressed density
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is selected, the drive will return an error.
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This is generally not an issue for modern tape drives.
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.It Cm density
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Set the density for the drive.
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|
For the density codes, see below.
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The density value could be given either numerically, or as a string,
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corresponding to the
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.Dq Reference
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field.
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If the string is abbreviated, it will be resolved in the order
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shown in the table, and the first matching entry will be used.
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If the
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given string and the resulting canonical density name do not match
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exactly, an informational message is output about what the given
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string has been taken for.
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.El
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.Pp
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|
The initial version of the density table below was taken from the
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.Sq Historical sequential access density codes
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table (A-1) in Revision 11 of the SCSI-3 Stream Device Commands (SSC)
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working draft, dated November 11, 1997.
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Subsequent additions have come from a number of sources.
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|
.Pp
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|
The density codes are:
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.Bd -literal -offset 2n
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0x0 default for device
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0xE reserved for ECMA
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Value Width Tracks Density Code Type Reference Note
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mm in bpmm bpi
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0x01 12.7 (0.5) 9 32 (800) NRZI R X3.22-1983 2
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0x02 12.7 (0.5) 9 63 (1,600) PE R X3.39-1986 2
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0x03 12.7 (0.5) 9 246 (6,250) GCR R X3.54-1986 2
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0x05 6.3 (0.25) 4/9 315 (8,000) GCR C X3.136-1986 1
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0x06 12.7 (0.5) 9 126 (3,200) PE R X3.157-1987 2
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0x07 6.3 (0.25) 4 252 (6,400) IMFM C X3.116-1986 1
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0x08 3.81 (0.15) 4 315 (8,000) GCR CS X3.158-1987 1
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0x09 12.7 (0.5) 18 1,491 (37,871) GCR C X3.180 2
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|
0x0A 12.7 (0.5) 22 262 (6,667) MFM C X3B5/86-199 1
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0x0B 6.3 (0.25) 4 63 (1,600) PE C X3.56-1986 1
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|
0x0C 12.7 (0.5) 24 500 (12,690) GCR C HI-TC1 1,6
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|
0x0D 12.7 (0.5) 24 999 (25,380) GCR C HI-TC2 1,6
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|
0x0F 6.3 (0.25) 15 394 (10,000) GCR C QIC-120 1,6
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0x10 6.3 (0.25) 18 394 (10,000) GCR C QIC-150 1,6
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0x11 6.3 (0.25) 26 630 (16,000) GCR C QIC-320 1,6
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0x12 6.3 (0.25) 30 2,034 (51,667) RLL C QIC-1350 1,6
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0x13 3.81 (0.15) 1 2,400 (61,000) DDS CS X3B5/88-185A 5
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0x14 8.0 (0.315) 1 1,703 (43,245) RLL CS X3.202-1991 5,11
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0x15 8.0 (0.315) 1 1,789 (45,434) RLL CS ECMA TC17 5,12
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0x16 12.7 (0.5) 48 394 (10,000) MFM C X3.193-1990 1
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0x17 12.7 (0.5) 48 1,673 (42,500) MFM C X3B5/91-174 1
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0x18 12.7 (0.5) 112 1,673 (42,500) MFM C X3B5/92-50 1
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0x19 12.7 (0.5) 128 2,460 (62,500) RLL C DLTapeIII 6,7
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0x1A 12.7 (0.5) 128 3,214 (81,633) RLL C DLTapeIV(20) 6,7
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0x1B 12.7 (0.5) 208 3,383 (85,937) RLL C DLTapeIV(35) 6,7
|
|
0x1C 6.3 (0.25) 34 1,654 (42,000) MFM C QIC-385M 1,6
|
|
0x1D 6.3 (0.25) 32 1,512 (38,400) GCR C QIC-410M 1,6
|
|
0x1E 6.3 (0.25) 30 1,385 (36,000) GCR C QIC-1000C 1,6
|
|
0x1F 6.3 (0.25) 30 2,666 (67,733) RLL C QIC-2100C 1,6
|
|
0x20 6.3 (0.25) 144 2,666 (67,733) RLL C QIC-6GB(M) 1,6
|
|
0x21 6.3 (0.25) 144 2,666 (67,733) RLL C QIC-20GB(C) 1,6
|
|
0x22 6.3 (0.25) 42 1,600 (40,640) GCR C QIC-2GB(C) ?
|
|
0x23 6.3 (0.25) 38 2,666 (67,733) RLL C QIC-875M ?
|
|
0x24 3.81 (0.15) 1 2,400 (61,000) CS DDS-2 5
|
|
0x25 3.81 (0.15) 1 3,816 (97,000) CS DDS-3 5
|
|
0x26 3.81 (0.15) 1 3,816 (97,000) CS DDS-4 5
|
|
0x27 8.0 (0.315) 1 3,056 (77,611) RLL CS Mammoth 5
|
|
0x28 12.7 (0.5) 36 1,491 (37,871) GCR C X3.224 1
|
|
0x29 12.7 (0.5)
|
|
0x2A
|
|
0x2B 12.7 (0.5) 3 ? ? ? C X3.267 5
|
|
0x40 12.7 (0.5) 384 4,800 (123,952) C LTO-1
|
|
0x41 12.7 (0.5) 208 3,868 (98,250) RLL C DLTapeIV(40) 6,7
|
|
0x42 12.7 (0.5) 512 7,398 (187,909) C LTO-2
|
|
0x44 12.7 (0.5) 704 9,638 (244,805) C LTO-3
|
|
0x46 12.7 (0.5) 896 12,725 (323,215) C LTO-4
|
|
0x47 3.81 (0.25) ? 6,417 (163,000) CS DAT-72
|
|
0x48 12.7 (0.5) 448 5,236 (133,000) PRML C SDLTapeI(110) 6,8,13
|
|
0x49 12.7 (0.5) 448 7,598 (193,000) PRML C SDLTapeI(160) 6,8
|
|
0x4A 12.7 (0.5) 768 ? C T10000A 10
|
|
0x4B 12.7 (0.5) 1152 ? C T10000B 10
|
|
0x4C 12.7 (0.5) 3584 ? C T10000C 10
|
|
0x4D 12.7 (0.5) 4608 ? C T10000D 10
|
|
0x51 12.7 (0.5) 512 11,800 (299,720) C 3592A1 (unencrypted)
|
|
0x52 12.7 (0.5) 896 11,800 (299,720) C 3592A2 (unencrypted)
|
|
0x53 12.7 (0.5) 1152 13,452 (341,681) C 3592A3 (unencrypted)
|
|
0x54 12.7 (0.5) 2560 19,686 (500,024) C 3592A4 (unencrypted)
|
|
0x55 12.7 (0.5) 5120 20,670 (525,018) C 3592A5 (unencrypted)
|
|
0x56 12.7 (0.5) 7680 20,670 (525,018) C 3592B5 (unencrypted)
|
|
0x58 12.7 (0.5) 1280 15,142 (384,607) C LTO-5
|
|
0x5A 12.7 (0.5) 2176 15,142 (384,607) C LTO-6
|
|
0x5C 12.7 (0.5) 3584 19,107 (485,318) C LTO-7
|
|
0x5E 12.7 (0.5) 6656 20,669 (524,993) C LTO-8
|
|
0x71 12.7 (0.5) 512 11,800 (299,720) C 3592A1 (encrypted)
|
|
0x72 12.7 (0.5) 896 11,800 (299,720) C 3592A2 (encrypted)
|
|
0x73 12.7 (0.5) 1152 13,452 (341,681) C 3592A3 (encrypted)
|
|
0x74 12.7 (0.5) 2560 19,686 (500,024) C 3592A4 (encrypted)
|
|
0x75 12.7 (0.5) 5120 20,670 (525,018) C 3592A5 (encrypted)
|
|
0x76 12.7 (0.5) 7680 20,670 (525,018) C 3592B5 (encrypted)
|
|
0x8c 8.0 (0.315) 1 1,789 (45,434) RLL CS EXB-8500c 5,9
|
|
0x90 8.0 (0.315) 1 1,703 (43,245) RLL CS EXB-8200c 5,9
|
|
.Ed
|
|
.Bd -literal -offset 2n
|
|
Code Description Type Description
|
|
---- -------------------------------------- ---- -----------
|
|
NRZI Non return to zero, change on ones R Reel-to-reel
|
|
GCR Group code recording C Cartridge
|
|
PE Phase encoded CS Cassette
|
|
IMFM Inverted modified frequency modulation
|
|
MFM Modified frequency modulation
|
|
DDS DAT data storage
|
|
RLL Run length limited
|
|
PRML Partial Response Maximum Likelihood
|
|
.Ed
|
|
.Bd -literal -offset 2n
|
|
NOTES
|
|
1. Serial recorded.
|
|
2. Parallel recorded.
|
|
3. Old format known as QIC-11.
|
|
5. Helical scan.
|
|
6. This is not an American National Standard. The reference is based
|
|
on an industry standard definition of the media format.
|
|
7. DLT recording: serially recorded track pairs (DLTapeIII and
|
|
DLTapeIV(20)), or track quads (DLTapeIV(35) and DLTapeIV(40)).
|
|
8. Super DLT (SDLT) recording: 56 serially recorded logical tracks
|
|
with 8 physical tracks each.
|
|
9. Vendor-specific Exabyte density code for compressed format.
|
|
10. bpi/bpmm values for the Oracle/StorageTek T10000 tape drives are
|
|
not listed in the manual. Someone with access to a drive can
|
|
supply the necessary values by running 'mt getdensity'.
|
|
11. This is Exabyte 8200 uncompressed format. The compressed format
|
|
density code is 0x90.
|
|
12. This is Exabyte 8500 uncompressed format. The compressed format
|
|
density code is 0x8c.
|
|
13. This density code (0x48) was also used for DAT-160.
|
|
.Ed
|
|
.Sh ENVIRONMENT
|
|
.Bl -tag -width ".Ev TAPE"
|
|
.It Ev TAPE
|
|
This is the pathname of the tape drive.
|
|
The default (if the variable is unset, but not if it is null) is
|
|
.Pa /dev/nsa0 .
|
|
It may be overridden with the
|
|
.Fl f
|
|
option.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -width ".Pa /dev/*sa[0-9]*" -compact
|
|
.It Pa /dev/*sa[0-9]*
|
|
SCSI magnetic tape interface
|
|
.El
|
|
.Sh DIAGNOSTICS
|
|
The exit status will be 0 when the drive operations were successful,
|
|
2 when the drive operations were unsuccessful, and 1 for other
|
|
problems like an unrecognized command or a missing drive device.
|
|
.Sh COMPATIBILITY
|
|
Some undocumented commands support old software.
|
|
.Sh SEE ALSO
|
|
.Xr dd 1 ,
|
|
.Xr ioctl 2 ,
|
|
.Xr mtio 4 ,
|
|
.Xr sa 4 ,
|
|
.Xr environ 7
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
command appeared in
|
|
.Bx 4.3 .
|
|
.Pp
|
|
Extensions regarding the
|
|
.Xr st 4
|
|
driver appeared in
|
|
.Bx 386 0.1
|
|
as a separate
|
|
.Nm st
|
|
command, and have been merged into the
|
|
.Nm
|
|
command in
|
|
.Fx 2.1 .
|
|
.Pp
|
|
The former
|
|
.Cm eof
|
|
command that used to be a synonym for
|
|
.Cm weof
|
|
has been abandoned in
|
|
.Fx 2.1
|
|
since it was often confused with
|
|
.Cm eom ,
|
|
which is fairly dangerous.
|
|
.Sh BUGS
|
|
The utility cannot be interrupted or killed during a long erase
|
|
(which can be longer than an hour), and it is easy to forget
|
|
that the default erase is long.
|
|
.Pp
|
|
Hardware block numbers do not always correspond to blocks on the tape
|
|
when the drive uses internal compression.
|
|
.Pp
|
|
Erasure is not guaranteed if the tape is not at its beginning.
|
|
.Pp
|
|
Tape-related documentation is poor, here and elsewhere.
|