fd64dc9a18
o Introduce -r and -w keys which allow to load and save a worklist. o Replace README by man page. PR: bin/96677 Submitted by: Ulrich Spoerlein Approved by: phk MFC after: 1 month
129 lines
4.0 KiB
Groff
129 lines
4.0 KiB
Groff
.\" Copyright (c) 2006 Ulrich Spoerlein <uspoerlein@gmail.com>
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd May 6, 2006
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.Dt RECOVERDISK 1
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.Os
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.Sh NAME
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.Nm recoverdisk
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.Nd recover data from hard disk or optical media
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.Sh SYNOPSIS
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.Nm
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.Op Fl r Ar rlist
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.Op Fl w Ar wlist
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.Ar special
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.Op file
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.Sh DESCRIPTION
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The
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.Nm
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utility reads data from the
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.Pa special
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file until all blocks could be successfully read.
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It starts reading in multiples of the sector size.
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Whenever a block fails, it is put to the end of the working queue and will be
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read again, possibly with a smaller read size.
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.Pp
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It uses block sizes of roughly 1 MB, 64kB, and the native sector size (usually
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512 bytes).
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These figures are adjusted slightly, for devices whose sectorsize is not a
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power of 2, e.g., audio CDs with a sector size of 2352 bytes.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl r Ar rlist
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Read the list of blocks and block sizes to read from the specified file.
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.It Fl w Ar wlist
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Write the list of remaining blocks to read to the specified file if
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.Nm
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is aborted via SIGINT.
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.El
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.Pp
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The
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.Fl r
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and
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.Fl w
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option can be used in combination.
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Especially, they can point to the same file, which will be updated on abort.
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.Sh OUTPUT
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.Nm
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prints several columns, detailing the progress
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.Bl -tag -width remaining
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.It start
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Starting offset of the current block.
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.It size
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Read size of the current block.
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.It len
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Length of the current block.
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.It state
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Is increased for every failed read.
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.It done
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Number of bytes already read.
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.It remaining
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Number of bytes remaining.
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.It % done
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Percent complete.
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.El
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.Sh EXAMPLES
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# recover data from failing hard drive ad3
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.Dl $ touch /data/lots_of_space
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.Dl $ recoverdisk /dev/ad3 /data/lots_of_space
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.Pp
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# clone a hard disk
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.Dl $ recoverdisk /dev/ad3 /dev/ad4
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.Pp
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# read an ISO image from a CD-ROM
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.Dl $ touch /data/cd.iso; recoverdisk /dev/acd0 /data/cd.iso
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.Pp
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# continue reading from a broken CD and update the existing worklist
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.Dl $ recoverdisk -r worklist -w worklist /dev/acd0 /data/cd.iso
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.Pp
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# recover a single file from the unreadable media
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.Dl $ touch file.avi; recoverdisk /cdrom/file.avi file.avi
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.Sh SEE ALSO
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.Xr dd 1
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.Sh HISTORY
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The
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.Nm
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command first appeared in
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.Fx 7.0 .
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.Sh BUGS
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Reading from media where the sectorsize is not a power of 2 will make all
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1 MB reads fail.
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This is due to the DMA reads being split up into blocks of at most 128kB.
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These reads then fail if the sectorsize is not a divisor of 128kB.
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When reading a full raw audio CD, this leads to roughly 700 error messages
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flying by.
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This is harmless.
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.Sh AUTHORS
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.An -nosplit
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The original implementation was done by
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.An Poul-Henning Kamp Aq phk@freebsd.org
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with minor improvements from
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.An Ulrich Sp\(:orlein Aq uspoerlein@gmail.com .
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.Pp
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This manual page was written by
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.An Ulrich Sp\(:orlein Aq uspoerlein@gmail.com .
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