Re: [Bug-ddrescue] disc>disc copy done. can't mount target drive.

[andrew zajac]

Hi Jaime.

Perhaps some of the errors are found in the first block of the drive and hence the partition table is broken?  That would explain why its partitions are not showing up.

You can use testdisk to try to find partitions on the drive.  I also like mmls from the Sleuth Kit.

You can then multiply the number of blocks by 512 and then mount the partition as a loop device with an offset.

For example, if the first partition started at block 63, 63 X 512=32256

mkdir mnt
sudo mount -o loop,offset=32256 /dev/sdb mnt


Good luck!

Andrew Zajac



--- On Mon, 3/8/10, Jaime Frontero <address@hidden> wrote:

From: Jaime Frontero <address@hidden>
Subject: [Bug-ddrescue] disc>disc copy done. can't mount target drive.
To: address@hidden
Received: Monday, March 8, 2010, 2:45 AM

so i have a FAT32 1TB drive with errors, and used gddrescue in whole disc mode to rescue it to a 2TB drive.  i used the following commands:

ddrescue -n /dev/sdh /dev/sdb logfile  [nb:33 hours of cranking...]
ddrescue -dr2 /dev/sdh /dev/sdb logfile

/dev/sdh is in a USB enclosure, /dev/sdb is connected normally to the motherboard (both drives are SATA).

the data noted as saved was impressive - only about 300kb of errors left, out of over 900 GB.

i followed the instructions for disc>disc rescue in the man page: "Note: you do not need to partition /dev/hdb [/dev/sdb in my case] beforehand."  i did not partition /dev/sdb.

but now (Mint 8=Ubuntu 9.10), while i can see the target drive (marked healthy) in the disk utility, all i see is unallocated space.  i can't figure out how to mount the blasted thing without re-partitioning it (that would probably be a /bad/ thing, yes?).  i'm assuming - given the time it spent having stuff copied onto it - that the data is there *somewhere*.

where is it?  how do i get it?  embarrassing - i'm probably missing something abysmally simple...

thank you.

jaime
                         
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