Fellow Pluggers, I got hammered yesterday morning by the inevitable
hard disk failure :-(
My mail backup is about 6 weeks old, my documents backup is
similar... but everything else is, apparently, gone.
Based on the error message it appears to be a hardware failure.
Here's my question:
This is the disk map from fdisk:
# fdisk /dev/hdb
The number of cylinders for this disk is set to 7297.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Command (m for help): p
Disk /dev/hdb: 60.0 GB, 60022480896 bytes
255 heads, 63 sectors/track, 7297 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/hdb1 * 1 2 16033+ 83 Linux
/dev/hdb2 3 68 530145 82 Linux swap
/dev/hdb3 69 7297 58066942+ f W95 Ext'd (LBA)
/dev/hdb5 69 7297 58066911 83 Linux
Ive managed to get the data off from the old root partition
dd if=/dev/hdb5 of=/data/recovery bs=8k conv=noerror
It had to ignore 7 errors to do that:
The messages were like this but repeated a number of times:
dd: reading `/dev/hdb5': Input/output error
2200+0 records in
2200+0 records out
cat dd.log |sort -un |grep 'records in'
2200+0 records in
10621+0 records in
10872+0 records in
16768+0 records in
2566020+0 records in
2568383+0 records in
3705765+0 records in
7258311+1 records in (this is the last record - not an error)
Here's the file that results:
-rw-r--r-- 1 root root 59460090880 Sep 8 12:09 recovery
(almost 60 Gig file!)
Now, I try to mount the data file as a filesystem:
mount /home/buffer/recovery /mnt/tmp/ -t reiserfs -o
but I always end up with this "helpful" message:
mount: wrong fs type, bad option, bad superblock on /dev/loop1,
or too many mounted file systems
(could this be the IDE device where you in fact use
ide-scsi so that sr0 or sda or so is needed?)
I say "helpful" in the sense that it cannot tell the difference
between "wrong fs type" and, for example, "too many mounted file
Before somebody points it out: Yes, it's a reiserfs. The error
messages refered to reiserfs and the same errors happen with ext2fs
or ext3fs. It was running SuSE 9.0 Professional.
Can anybody point me to some useful sites and/or tools for trying to
I tried google but the data recovery companies are so clever that they've
managed to turn every available link that looks informational into an
advertisement for their pay software or service. I don't mind paying
if I *have to* do so but would prefer to really try something myself
first. Once I explored the dd and mount options I've reached (some
would say exceeded) my knowledge limit on data recovery.
# Eric Lucas - temporarily running as email@example.com
# until the mess is fixed...
# one way or the other!
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