06-12-2009
Can't Mount Disk / Image after bad unmount
I have had a little issue with one of my disks, the usb cacble was pulled out and one of the external drives on it would no longer mount. I used First Aid and it verified and repaired both OK / nothing to do). After lots of messing around and not being able to mount I used Drive Genius 2 and that verified / rebuilt OK again with nothing to do.
Next I used that to duplicate to a disk image. At this point I re-formatted the disk and thats working fine now. The image I created has the same issue. I can see the partition in there but Disk Util / hdiutil can not mount the image. I get the following when trying to fsck the image (or disk before I reformatted):
BAD SUPER BLOCK: MAGIC NUMBER WRONG
I wrote a quick script and found 1 additional super block but fsck seg faults when I use that.
Some more info:
"./disk2s1.dmg: Macintosh HFS Extended version 4 data last mounted by: 'fsck', created: Sat Mar 7 18:42:44 2009, last modified: Mon Jun 1 08:40:53 2009, last checked: Sat Mar 7 18:42:44 2009, block size: 4096, number of blocks: 4883752, free blocks: 95358"
Its only a small 20GB drive. There are scripts and files I would like to recover but have no way to get this anyone have any ideas?
A simple:
cat disk2s1.dmg | strings
I can see file names I know are on the drive, so the data does seem to be intact just no easy way to get at it.
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FSCK(1) General Commands Manual FSCK(1)
NAME
fsck, fsck1 - perform file system consistency check
SYNOPSIS
fsck [-aclmrs] [device] ...
OPTIONS
-a Automatically repair inconsistencies
-c Check and list only the specified i-nodes
-l List the files and directories in the filesytem
-r Prompt user for repairs if inconsistencies are found
-s List the superblock of the file system
EXAMPLES
fsck /dev/hd4 # Check file system on /dev/hd4
fsck -a /dev/at0 # Automatically fix errors on /dev/at0
fsck -l /dev/fd0 # List the contents of /dev/fd0
fsck -c 2 3 /dev/hd3
# Check and list /dev/hd3 i-nodes 2 & 3
DESCRIPTION
Fsck performs consistency checks on the file systems which reside on the specified devices. Fsck1 is an alternate version for use on obso-
lete V1 file systems. When either the -a or -r flags are given, the file system will be repaired if errors are found. Before running fsck
on a mounted file system, it must first be unmounted. Trying to repair a mounted file system is dangerous and should not be attempted.
To repair the root file system (which cannot be unmounted), first type CTRL-F9 at the console to kill any and all processes. Log back in
as root, type sync to force any buffered changes to disk, run fsck on the root file system and immediately reboot the computer by typing
reboot.
It is necessary to kill all processes before repairing the root file system to prevent them from modifying any disk blocks while fsck is
running. This is only necessary for the root file system, any other file system can simply be unmounted before it is checked.
SEE ALSO
mkfs(1), mount(1).
FSCK(1)