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Old 5th January 2010
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Default Corrupted msdos filesystem on a compactflash card - recovery

Hei,

One of my CompactFlash cards has a corrupted filesystem, and I wonder if I can do anything about it to recover some of the photos I still have there.

I have tried to run fsck_msdosfs, and the result is this:

Code:
$ fsck_msdosfs -py /dev/da0s1
** /dev/da0s1
** Phase 1 - Read and Compare FATs
** Phase 2 - Check Cluster Chains
** Phase 3 - Checking Directories
** Phase 4 - Checking for Lost Files
297 files, 1152256 free (36008 clusters)

$ fsck_msdosfs -y /dev/da0
** /dev/da0
Invalid sector size: 20487
The dcim/101msdcf appears as a file, whereas it's normally a directory with jpeg files in it. Post mount:

Code:
$ file dcim/101msdcf 
dcim/101msdcf: ERROR: cannot read `dcim/101msdcf' (Argument list too long)
Do you have any hints as to what I could do to recover the files?
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Old 5th January 2010
BSDfan666 BSDfan666 is offline
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There are a couple utilities that will scan over a medium and can recover common image/document formats, although if any of the files are fragmented it might not be able to recover them properly.

FreeBSD has the sysutils/testdisk port available, photorec which is also included.. may be helpful.

I'm not sure of the details of the FAT file system, but you probably should have left it as-is.. make an image of it, don't mount it read/write.. it's possible that you lost all of those images.

You cannot recover overwritten files, just "misplaced" ones.
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Old 5th January 2010
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testdisk complains about geometry. I have tried (as suggested) 16,32,64,128,240,255 heads per cylinder, and none of these results in anything useful; it still complains about "bad ending head".

With the following values (256 cylinders, 255 heads, 63 sectors per track, 512 sector size), what I see is this:

http://img177.imageshack.us/img177/3646/headsf.png

http://img177.imageshack.us/img177/3830/heads2.png

http://img177.imageshack.us/img177/1032/dirx.png

http://img177.imageshack.us/img177/4308/dir2.png

Are there any other values of heads I should try, and if not, what else remains to do? I have created the image.dd file so far.
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Old 6th January 2010
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You should use photorec, which as I said.. is included with testdisk.
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Old 6th January 2010
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Thank you kindly, sir. Apart from a few damaged files, I recovered just about everything.

May leaves always rustle under your feet.
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