129 lines
4.0 KiB
Groff
129 lines
4.0 KiB
Groff
|
.\" Copyright (c) 2006 Ulrich Spoerlein <uspoerlein@gmail.com>
|
||
|
|
.\" All rights reserved.
|
||
|
|
.\"
|
||
|
|
.\" Redistribution and use in source and binary forms, with or without
|
||
|
|
.\" modification, are permitted provided that the following conditions
|
||
|
|
.\" are met:
|
||
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer.
|
||
|
|
.\" 2. Redistributions in binary form must reproduce the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
||
|
|
.\" documentation and/or other materials provided with the distribution.
|
||
|
|
.\"
|
||
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
||
|
|
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
|
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
|
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
||
|
|
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
||
|
|
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
||
|
|
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||
|
|
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
||
|
|
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||
|
|
.\" SUCH DAMAGE.
|
||
|
|
.\"
|
||
|
|
.\" $FreeBSD$
|
||
|
|
.\"
|
||
|
|
.Dd May 6, 2006
|
||
|
|
.Dt RECOVERDISK 1
|
||
|
|
.Os
|
||
|
|
.Sh NAME
|
||
|
|
.Nm recoverdisk
|
||
|
|
.Nd recover data from hard disk or optical media
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Nm
|
||
|
|
.Op Fl r Ar rlist
|
||
|
|
.Op Fl w Ar wlist
|
||
|
|
.Ar special
|
||
|
|
.Op file
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
utility reads data from the
|
||
|
|
.Pa special
|
||
|
|
file until all blocks could be successfully read.
|
||
|
|
It starts reading in multiples of the sector size.
|
||
|
|
Whenever a block fails, it is put to the end of the working queue and will be
|
||
|
|
read again, possibly with a smaller read size.
|
||
|
|
.Pp
|
||
|
|
It uses block sizes of roughly 1 MB, 64kB, and the native sector size (usually
|
||
|
|
512 bytes).
|
||
|
|
These figures are adjusted slightly, for devices whose sectorsize is not a
|
||
|
|
power of 2, e.g., audio CDs with a sector size of 2352 bytes.
|
||
|
|
.Pp
|
||
|
|
The options are as follows:
|
||
|
|
.Bl -tag -width indent
|
||
|
|
.It Fl r Ar rlist
|
||
|
|
Read the list of blocks and block sizes to read from the specified file.
|
||
|
|
.It Fl w Ar wlist
|
||
|
|
Write the list of remaining blocks to read to the specified file if
|
||
|
|
.Nm
|
||
|
|
is aborted via SIGINT.
|
||
|
|
.El
|
||
|
|
.Pp
|
||
|
|
The
|
||
|
|
.Fl r
|
||
|
|
and
|
||
|
|
.Fl w
|
||
|
|
option can be used in combination.
|
||
|
|
Especially, they can point to the same file, which will be updated on abort.
|
||
|
|
.Sh OUTPUT
|
||
|
|
.Nm
|
||
|
|
prints several columns, detailing the progress
|
||
|
|
.Bl -tag -width remaining
|
||
|
|
.It start
|
||
|
|
Starting offset of the current block.
|
||
|
|
.It size
|
||
|
|
Read size of the current block.
|
||
|
|
.It len
|
||
|
|
Length of the current block.
|
||
|
|
.It state
|
||
|
|
Is increased for every failed read.
|
||
|
|
.It done
|
||
|
|
Number of bytes already read.
|
||
|
|
.It remaining
|
||
|
|
Number of bytes remaining.
|
||
|
|
.It % done
|
||
|
|
Percent complete.
|
||
|
|
.El
|
||
|
|
.Sh EXAMPLES
|
||
|
|
# recover data from failing hard drive ad3
|
||
|
|
.Dl $ touch /data/lots_of_space
|
||
|
|
.Dl $ recoverdisk /dev/ad3 /data/lots_of_space
|
||
|
|
.Pp
|
||
|
|
# clone a hard disk
|
||
|
|
.Dl $ recoverdisk /dev/ad3 /dev/ad4
|
||
|
|
.Pp
|
||
|
|
# read an ISO image from a CD-ROM
|
||
|
|
.Dl $ touch /data/cd.iso; recoverdisk /dev/acd0 /data/cd.iso
|
||
|
|
.Pp
|
||
|
|
# continue reading from a broken CD and update the existing worklist
|
||
|
|
.Dl $ recoverdisk -r worklist -w worklist /dev/acd0 /data/cd.iso
|
||
|
|
.Pp
|
||
|
|
# recover a single file from the unreadable media
|
||
|
|
.Dl $ touch file.avi; recoverdisk /cdrom/file.avi file.avi
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr dd 1
|
||
|
|
.Sh HISTORY
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
command first appeared in
|
||
|
|
.Fx 7.0 .
|
||
|
|
.Sh BUGS
|
||
|
|
Reading from media where the sectorsize is not a power of 2 will make all
|
||
|
|
1 MB reads fail.
|
||
|
|
This is due to the DMA reads being split up into blocks of at most 128kB.
|
||
|
|
These reads then fail if the sectorsize is not a divisor of 128kB.
|
||
|
|
When reading a full raw audio CD, this leads to roughly 700 error messages
|
||
|
|
flying by.
|
||
|
|
This is harmless.
|
||
|
|
.Sh AUTHORS
|
||
|
|
.An -nosplit
|
||
|
|
The original implementation was done by
|
||
|
|
.An Poul-Henning Kamp Aq phk@freebsd.org
|
||
|
|
with minor improvements from
|
||
|
|
.An Ulrich Sp\(:orlein Aq uspoerlein@gmail.com .
|
||
|
|
.Pp
|
||
|
|
This manual page was written by
|
||
|
|
.An Ulrich Sp\(:orlein Aq uspoerlein@gmail.com .
|