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Old 10-27-2006, 05:47 PM   #1
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USB Disk - Reports as 8Mb - Recoverable?


I'm not sure if this is exactly the right category, but here goes...

Basically, I have a friend's 1Gb usb disk with important data that always reports itself as 8Mb now, with a b0rked partition table, and I need to get some important data off it (think latest copy of thesis, she has old copies but from back).

I originally made a post an gentoo forums, I suppose it's ok if I make a post here as well? (I would post the link, but forum won't let search for "usb 8mb")

fdisk -l output
victorhooi@riv-cheron:/datastore$ fdisk -l /dev/sda Disk /dev/sda: 8 MB, 8388608 bytes 1 heads, 16 sectors/track, 1024 cylinders Units = cylinders of 16 * 512 = 8192 bytes Disk /dev/sda doesn't contain a valid partition table victorhooi@riv-cheron:/datastore$
dmesg output (Ubuntu 6.06 Live)
[4295784.710000] usb 2-1: new full speed USB device using uhci_hcd and address 2 [4295787.073000] SCSI subsystem initialized [4295787.184000] Initializing USB Mass Storage driver... [4295787.186000] scsi0 : SCSI emulation for USB Mass Storage devices [4295787.186000] usb-storage: device found at 2 [4295787.186000] usb-storage: waiting for device to settle before scanning [4295787.187000] usbcore: registered new driver usb-storage [4295787.187000] USB Mass Storage support registered. [4295792.191000] Vendor: ChipsBnk Model: Flash Disk Rev: 2.00 [4295792.191000] Type: Direct-Access ANSI SCSI revision: 02 [4295792.199000] usb-storage: device scan complete [4295792.279000] Driver 'sd' needs updating - please use bus_type methods [4295792.286000] SCSI device sda: 16384 512-byte hdwr sectors (8 MB) [4295792.290000] sda: Write Protect is off [4295792.290000] sda: Mode Sense: 0b 00 00 08 [4295792.290000] sda: assuming drive cache: write through [4295792.300000] SCSI device sda: 16384 512-byte hdwr sectors (8 MB) [4295792.303000] sda: Write Protect is off [4295792.303000] sda: Mode Sense: 0b 00 00 08 [4295792.303000] sda: assuming drive cache: write through [4295792.303000] sda: unknown partition table [4295792.326000] sd 0:0:0:0: Attached scsi removable disk sda [4295792.362000] sd 0:0:0:0: Attached scsi generic sg0 type 0
No matter how I kick and scream at dd, it always spits out a 8Mb image file. Is there any way to force Linux to see geometry beyond 8Mb for a USB disk?

(As an aside, I used a "surplus sectors" option in WinHex, which then reported it as a 128 Gb also that everything was a bad sector...hmm...not good...if i can just get the rest of the 1Gb though, I can pipe it through autospy).


PS: Also, I managed to hose my ubuntu install, forced an uninstall of libc6 (don't ask...*sigh*), so I'm posting from the liveCD. Any suggestions for that? I suppose just downloading 6.10 and upgrading will work?
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Old 10-27-2006, 07:16 PM   #2
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Responded on Gentoo as that thread was active and contains more info.


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