RIP Thinkpad / Mount partition of whole-disk-dd-image

Posted March 5th, 2008 by ch3ka

My IBM Thinkpad T41 is no more.

I don't like Passwords, so I use cryptographic Certificates. They are all stored on the Thinkpads HDD, along with all my Mails and Stuff, so I'm pretty much separated from the outside world since the Laptop died last Friday.

Sure I do have backups, but they were 200km away from me (or i was 200km away from my filer, spoken correctly) and they were 12h old. So I headed back home and connected the Laptops HDD to my Workstation via USB and dumped the HDD contents via dd:
dd if=/dev/sdh | split -db2024m thinkpad.dd.iso.
(had to use split becuz I stored it on a FAT32 external USB drive)

Now comes the tricky part: I now have no working Laptop left, so I decided to split my Workstations RAID10 into 4 single drives and install one OS per drive: WindowsXP, OpenSolaris, Ubuntu and Gentoo. The Gentoo Installation should be an exact copy of my Laptops Setup, so when I have my new Laptop I keep them in sync via rsync and when my laptop breaks again I'll lose neither data nor time to restore.

So I installed Ubuntu and copied the HDD Image to my home dir there
cat thinkpad.dd.iso.* > ~/thinkpad.dd.iso

My plan was to mount the FS and edit the config files in order to get a booting image. But as you saw above, I dumped the whole HDD, not the separate partitions.
What to do now?

Well, its easy when you hit on it:
Use the losetup Offset Option!
fdisk will tell you the correct byte offset
(in this case 512*2116800=1083801600)
# losetup /dev/loop0 thinkpad.dd.iso # fdisk -lu /dev/loop0 Disk /dev/loop0: 40.0 GB, 40007761920 bytes 240 heads, 63 sectors/track, 5168 cylinders, total 78140160 sectors Units = sectors of 1 * 512 = 512 bytes Disk identifier: 0x78db8e1b Device Boot Start End Blocks Id System /dev/loop0p1 * 63 120959 60448+ 83 Linux /dev/loop0p2 120960 2116799 997920 82 Linux swap / Solaris /dev/loop0p3 2116800 78140159 38011680 83 Linux # losetup -d /dev/loop0 # losetup -o1083801600 /dev/loop0 thinkpad.dd.iso # mount -t reiserfs /dev/loop0 /mnt/
And thats it!
I hope this little hack will save you time somewhen.

If you liked this, buy me a beer and / or comment below

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