87 lines
3.7 KiB
Groff
87 lines
3.7 KiB
Groff
.\" Copyright (c) 1980, 1989, 1991 The Regents of the University of California.
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.\" All rights reserved.
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. 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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.\" @(#)ft.8
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.\"
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.Dd February 7, 1994
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.Dt FT 8
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.Os BSD 4
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.Sh NAME
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.Nm ft
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.Nd QIC 40/80 floppy tape drive controller
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.Sh SYNOPSIS
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.Nm ft
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.Op Fl f Ar tape
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.Op Ar description
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.Sh DESCRIPTION
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The
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.Nm ft
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command allows multi-volume dump, extract, and view of tape labels, for
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any pre-formatted QIC-40/80 tapes. It is totally system dependent,
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and has nothing to do with the QIC standards.
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.Pp
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.Nm ft
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is used primarily as a filter for tape i/o.
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For example, to save and compress the /usr directory to tape:
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.Bd -literal -offset indent
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% tar cvzf - /usr | ft "/usr save"
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.Ed
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.Pp
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To extract /usr from tape:
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.Bd -literal -offset indent
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% ft | tar xvzf -
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.Ed
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.\" .Sh SEE ALSO
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.\" .Xr qtar 1
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.Sh BUGS
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Formatting/Verifying is in the works. You will need to use your
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existing backup program to do this for the time being.
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.Sh NOTES
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The floppy tape driver supports tape drives such as the Colorado
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Jumbo, Mountain Summit Express, some Archive/Conner models, and
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probably many others. These tape drives attach between your floppy
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disk controller card and your existing floppy disks' ribbon cable.
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This driver does not currently support attachments via a proprietary
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tape controller card or by the parallel port.
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.Pp
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QIC-40/80 drives are more CPU intensive than a SCSI drive. This is
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really only a factor if your machine is networked or has multiple concurrent
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users. For personal use (i.e. your typical home Unix user), response time
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is perfectly acceptable. The tape drives cannot detect write errors.
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Instead, they make up for it by using CRC's, error correction, and bad
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spot mapping. Formatting time is extremely long because of this. The
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drive makes a first pass over the entire tape writing out sectors. It
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then makes a second pass at a slower rate than usual (for sensitivity)
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to detect bad spots on the tape. Typically it takes an hour to format
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a single QIC-80 (120Mb uncompressed) tape.
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.Sh AUTHOR
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Steve Gerakines <steve2@genesis.nred.ma.us>
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