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Old 02-17-2007, 09:35 AM   #1
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dd vs dd_rescue

Someone gave me a USB zip drive to try to recover some files off of. I think the 250MB zip disk is damaged or going bad.

Anyway, I tried using both dd and dd_rescue on Debian Etch. The output file from dd is ~100MB and the output file from dd_rescue is 0MB. Why did dd return an image and dd_rescue returned nothing?

I used
dd_rescue -v -l dd.log /dev/sdc zipddr.img
for dd_rescue and
dd bs=512 if=/dev/sdc of=/home/patrick/zip/ziprecover.img conv=noerror,sync
for dd.

Here's tail end of the dd_rescue log I created
dd_rescue: (info): /dev/sdc (98304.0k): EOF
Summary for /dev/sdc -> zipddr.img:
dd_rescue: (info): ipos:     98304.0k, opos:     98304.0k, xferd:     98304.0k
                   errs: 196608, errxfer:     98304.0k, succxfer:         0.0k
             +curr.rate:        0kB/s, avg.rate:       10kB/s, avg.load:  0.3%
When I try to mount the dd image on loopback it fails. I can't even get anything off the image with foremost. There's just supposed to be *.doc files on the disk (a teacher's lesson plans).

Any ideas on what I need to do to mount the image or recover files off of it (assuming of course it wasn't too damaged)?
Old 02-17-2007, 11:35 AM   #2
Registered: Jun 2006
Location: Boaz,Alabama
Distribution: Ubuntu 10.10 / Windows 7 Pro 64-Bit / Snow Leopard 10.6.4 64-Bit
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dd_rescue skips badblocks, AfaIk, the disk is borked..... try testdisk + photorec on the drive if nothing else


dd, ddrescue, recovery

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