re: HELP!! Slice info disappeared
Hello Niall and Josef, Thanks for your great help. Finally I get all data on the disk back after the struggle on the weekend :) I run the program you sent me, but I got nothing from it. I guess the reason as follows: (1) The program fetches each chunks of 16 blocks from the disk and check if they are superblocks. (2) My disk is sliced into 3 parts. The fist one is for MS-DOS (FAT format), and the rest of them are FFS. It's highly possible that the offset block of the beginning of FFS slice is not a multiple of 16. (3) So I did: # for i in 0 1 2 3 ... 15; do # ./findsb /dev/wd2 $[ (estimated end of block for FAT slice)*512 + $i*512 ] # done After I got the info from the superblocks, getting back data was easy. Again, thanks much for your great help. You saved a lot of my time to reconstruct the data from scratch. Sincerely yours, -- Kazukiyo Ueda From: Josef Karthauser [EMAIL PROTECTED] Subject: re: HELP!! Slice info disappeared Date: Fri, 9 Jul 1999 10:01:16 +0100 Hi Kazukiyo, This is certainly possible. I've enclosed a hack from Niall Smart that should generated enough information to for you to reconstruct it. I'm working on a general solution to this for inclusion FreeBSD as shipped, but it's at home and I'm at work, that said it's Niall's basic code saved my harddisk a few weeks ago :) Joe To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
re: HELP!! Slice info disappeared
Hello Niall and Josef, Thanks for your great help. Finally I get all data on the disk back after the struggle on the weekend :) I run the program you sent me, but I got nothing from it. I guess the reason as follows: (1) The program fetches each chunks of 16 blocks from the disk and check if they are superblocks. (2) My disk is sliced into 3 parts. The fist one is for MS-DOS (FAT format), and the rest of them are FFS. It's highly possible that the offset block of the beginning of FFS slice is not a multiple of 16. (3) So I did: # for i in 0 1 2 3 ... 15; do # ./findsb /dev/wd2 $[ (estimated end of block for FAT slice)*512 + $i*512 ] # done After I got the info from the superblocks, getting back data was easy. Again, thanks much for your great help. You saved a lot of my time to reconstruct the data from scratch. Sincerely yours, -- Kazukiyo Ueda From: Josef Karthauser j...@pavilion.net Subject: re: HELP!! Slice info disappeared Date: Fri, 9 Jul 1999 10:01:16 +0100 Hi Kazukiyo, This is certainly possible. I've enclosed a hack from Niall Smart that should generated enough information to for you to reconstruct it. I'm working on a general solution to this for inclusion FreeBSD as shipped, but it's at home and I'm at work, that said it's Niall's basic code saved my harddisk a few weeks ago :) Joe To Unsubscribe: send mail to majord...@freebsd.org with unsubscribe freebsd-hackers in the body of the message
re: HELP!! Slice info disappeared
Hi Kazukiyo,
This is certainly possible. I've enclosed a hack from Niall Smart that should
generated enough information to for you to reconstruct it. I'm working on a
general solution to this for inclusion FreeBSD as shipped, but it's at home
and I'm at work, that said it's Niall's basic code saved my harddisk a few weeks
ago :)
Joe
- Forwarded message from Niall Smart [EMAIL PROTECTED] -
Date: Mon, 21 Jun 1999 13:48:45 +
From: Niall Smart [EMAIL PROTECTED]
Organization: Trinity Commerce
X-Mailer: Mozilla 4.6 [en] (X11; I; FreeBSD 3.2-STABLE i386)
X-Accept-Language: en
To: Josef Karthauser [EMAIL PROTECTED]
CC: [EMAIL PROTECTED]
Subject: Re: [DISKLABEL FRAGGED] Clues requested... ;)
Josef Karthauser wrote:
Guess what... I've got a disk where the partition table and the disklabel has
mysteriously disappeared! Oops.
I've reconstructed the partition table, and now need to partition the disklabel.
Wow, you're probably the first person ever to do that, unlucky you. Out
of sympathy I've written you this findsb program which of course I've
never had to use myself. Its not the most efficiently written program
ever
and since FreeBSD swap partitions don't have magic numbers it may be
slow,
but it seems to work, however I draw your attention to the disclaimer
in the C file. ;)
Regards,
Niall
niall% disklabel wd0s2 | sed -n '/fstype/,$p'
#size offsetfstype [fsize bsize bps/cpg]
a: 13107204.2BSD0 0 0 # (Cyl.0 -
8*)
b: 262144 131072 swap# (Cyl.8*-
24*)
c: 41929650unused0 0 # (Cyl.0 -
260)
e: 819200 3932164.2BSD0 0 0 # (Cyl. 24*-
75*)
f: 2980549 12124164.2BSD0 0 0 # (Cyl. 75*-
260*)
niall% ./findsb /dev/wd0s2 0
found superblock: offset=16384, fs_size=65536, fs_fsmnt=/
suggested disklabel entry:
size offsetfstype
13107204.2BSD
found superblock: offset=24576, fs_size=65536, fs_fsmnt=
suggested disklabel entry:
size offsetfstype
131072 164.2BSD
^C
niall% ./findsb /dev/wd0s2 $[393216 * 512 - 8192 * 10]
skipping 201244672 bytes
found superblock: offset=201342976, fs_size=409600, fs_fsmnt=/home
suggested disklabel entry:
size offsetfstype
819200 3932164.2BSD
found superblock: offset=201351168, fs_size=409600, fs_fsmnt=
suggested disklabel entry:
size offsetfstype
819200 3932324.2BSD
^C
PROG= findsb
CFLAGS = -aout -static -W -Wall -Wmissing-prototypes -Wstrict-prototypes
MAN1=
.include bsd.prog.mk
/*
* Copyright (c) 1999 Niall Smart. 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.
* 3. All advertising materials mentioning features or use of this software
*must display the following acknowledgement:
* This product includes software developed by Niall Smart, [EMAIL PROTECTED]
*
* THIS SOFTWARE IS PROVIDED BY NIALL SMART ``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 NIALL SMART 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.
*/
#include sys/types.h
#include sys/param.h
#include ufs/ffs/fs.h
#include stdio.h
#include unistd.h
#include fcntl.h
#include stddef.h
#include stdlib.h
#include limits.h
int
main(int argc, char** argv)
{
int fd;
int ret;
off_t offset;
u_quad_tskip;
char* ptr;
charbuf[SBSIZE];
struct fs* fs = (struct fs*)buf;
if (argc != 3) {
fprintf(stderr, "usage: %s device skip\n", argv[0]);
exit(1);
}
if ( (fd = open(argv[1], O_RDONLY)) 0) {
perror("open");
exit(1);
}
if ( (skip = strtouq(argv[2], ptr, 0)) == QUAD_MAX || *ptr != '\0') {
fprintf(stderr, "bad seek
re: HELP!! Slice info disappeared
Hi Kazukiyo,
This is certainly possible. I've enclosed a hack from Niall Smart that should
generated enough information to for you to reconstruct it. I'm working on a
general solution to this for inclusion FreeBSD as shipped, but it's at home
and I'm at work, that said it's Niall's basic code saved my harddisk a few weeks
ago :)
Joe
- Forwarded message from Niall Smart ni...@pobox.com -
Date: Mon, 21 Jun 1999 13:48:45 +
From: Niall Smart ni...@pobox.com
Organization: Trinity Commerce
X-Mailer: Mozilla 4.6 [en] (X11; I; FreeBSD 3.2-STABLE i386)
X-Accept-Language: en
To: Josef Karthauser j...@pavilion.net
CC: hack...@freebsd.org
Subject: Re: [DISKLABEL FRAGGED] Clues requested... ;)
Josef Karthauser wrote:
Guess what... I've got a disk where the partition table and the disklabel has
mysteriously disappeared! Oops.
I've reconstructed the partition table, and now need to partition the
disklabel.
Wow, you're probably the first person ever to do that, unlucky you. Out
of sympathy I've written you this findsb program which of course I've
never had to use myself. Its not the most efficiently written program
ever
and since FreeBSD swap partitions don't have magic numbers it may be
slow,
but it seems to work, however I draw your attention to the disclaimer
in the C file. ;)
Regards,
Niall
niall% disklabel wd0s2 | sed -n '/fstype/,$p'
#size offsetfstype [fsize bsize bps/cpg]
a: 13107204.2BSD0 0 0 # (Cyl.0 -
8*)
b: 262144 131072 swap# (Cyl.8*-
24*)
c: 41929650unused0 0 # (Cyl.0 -
260)
e: 819200 3932164.2BSD0 0 0 # (Cyl. 24*-
75*)
f: 2980549 12124164.2BSD0 0 0 # (Cyl. 75*-
260*)
niall% ./findsb /dev/wd0s2 0
found superblock: offset=16384, fs_size=65536, fs_fsmnt=/
suggested disklabel entry:
size offsetfstype
13107204.2BSD
found superblock: offset=24576, fs_size=65536, fs_fsmnt=
suggested disklabel entry:
size offsetfstype
131072 164.2BSD
^C
niall% ./findsb /dev/wd0s2 $[393216 * 512 - 8192 * 10]
skipping 201244672 bytes
found superblock: offset=201342976, fs_size=409600, fs_fsmnt=/home
suggested disklabel entry:
size offsetfstype
819200 3932164.2BSD
found superblock: offset=201351168, fs_size=409600, fs_fsmnt=
suggested disklabel entry:
size offsetfstype
819200 3932324.2BSD
^C
PROG= findsb
CFLAGS = -aout -static -W -Wall -Wmissing-prototypes -Wstrict-prototypes
MAN1=
.include bsd.prog.mk
/*
* Copyright (c) 1999 Niall Smart. 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.
* 3. All advertising materials mentioning features or use of this software
*must display the following acknowledgement:
* This product includes software developed by Niall Smart,
ni...@pobox.com.
*
* THIS SOFTWARE IS PROVIDED BY NIALL SMART ``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 NIALL SMART 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.
*/
#include sys/types.h
#include sys/param.h
#include ufs/ffs/fs.h
#include stdio.h
#include unistd.h
#include fcntl.h
#include stddef.h
#include stdlib.h
#include limits.h
int
main(int argc, char** argv)
{
int fd;
int ret;
off_t offset;
u_quad_tskip;
char* ptr;
charbuf[SBSIZE];
struct fs* fs = (struct fs*)buf;
if (argc != 3) {
fprintf(stderr, usage: %s device skip\n, argv[0]);
exit(1);
}
if ( (fd = open(argv[1], O_RDONLY)) 0) {
perror(open);
exit(1);
}
if ( (skip = strtouq(argv[2], ptr, 0)) == QUAD_MAX || *ptr != '\0') {
fprintf(stderr, bad seek value:
HELP!! Slice info disappeared
Hi hackers, I need your helps, please. I have two IDE drives. They have two slices for FreeBSD and Windows on each. Last night I tried to install Windows 95 on the first IDE drive where FreeBSD 3.1.0-Stable has installed. I executed fdisk program on MS-DOS and created an active slice to make it C: on the first drive. I successfully installed windows, and then rebooted FreeBSD. It's the beginning of my nightmare. On the boot time, kernel said there were no disklabel on the second IDE drive or something like that (sorry, I was so in panic that I didn't write them down on paper), and the system fall into single user mode. I checked the information for slices written on the second IDE, but it was almost the same as the first one. That is, each slices on second IDE have the same size on the first one. I didn't know what happened but I guess fdisk program changed the slice info not only for first IDE, but also the second one. I suppose (or wish) that the only slice information on the second IDE was overwritten, and the data on the second IDE are still there without any changes. Is there any way to retrieve the slice info? Any help is much appreciated. Thanks in advance, -- Kazukiyo UEDA To Unsubscribe: send mail to majord...@freebsd.org with unsubscribe freebsd-hackers in the body of the message
