||08-12-2007 05:58 AM
External USB disk: repeated file system corruption
I have a new external USB disk with an ext3 file system. It appears that the file system is getting corrupted about every second time I reboot my laptop. It has happened twice that the file system was corrupted, and both times I repaired with with e2fsck (losing some files). The first time, I had to run e2fsck 5 times before all errors were gone. The second time, I had to run e2fsck 8 times. After the last 8 runs, I rescued a few of the files in /lost+found, unmounted the disk, unplugged it, switched off the laptop, and booted up again. When I tried to mount the disk, I got the following error again:
# mount /dev/sdb1 /media/x/
mount: wrong fs type, bad option, bad superblock on /dev/sdb1,
missing codepage or other error
In some cases useful info is found in syslog - try
dmesg | tail or so
So I ran:
# dmesg | tail -n 27
[ 47.808000] eth0: no IPv6 routers present
[ 133.112000] usb 4-1: new high speed USB device using ehci_hcd and address 2
[ 133.244000] usb 4-1: configuration #1 chosen from 1 choice
[ 133.484000] usbcore: registered new interface driver libusual
[ 133.500000] Initializing USB Mass Storage driver...
[ 133.504000] scsi2 : SCSI emulation for USB Mass Storage devices
[ 133.504000] usbcore: registered new interface driver usb-storage
[ 133.504000] USB Mass Storage support registered.
[ 133.504000] usb-storage: device found at 2
[ 133.504000] usb-storage: waiting for device to settle before scanning
[ 139.504000] usb-storage: device scan complete
[ 144.032000] scsi 2:0:0:0: Direct-Access SAMSUNG HD501LJ 0-10 PQ: 0 ANSI: 2 CCS
[ 144.040000] SCSI device sdb: 976773168 512-byte hdwr sectors (500108 MB)
[ 144.040000] sdb: Write Protect is off
[ 144.040000] sdb: Mode Sense: 00 38 00 00
[ 144.040000] sdb: assuming drive cache: write through
[ 144.044000] SCSI device sdb: 976773168 512-byte hdwr sectors (500108 MB)
[ 144.044000] sdb: Write Protect is off
[ 144.044000] sdb: Mode Sense: 00 38 00 00
[ 144.044000] sdb: assuming drive cache: write through
[ 144.044000] sdb: sdb1
[ 144.052000] sd 2:0:0:0: Attached scsi disk sdb
[ 144.052000] sd 2:0:0:0: Attached scsi generic sg2 type 0
[ 149.496000] EXT3-fs error (device sdb1): ext3_check_descriptors: Block bitmap for group 790 not in group (block 3758096384)!
[ 149.504000] EXT3-fs: group descriptors corrupted!
[ 208.312000] EXT3-fs error (device sdb1): ext3_check_descriptors: Block bitmap for group 790 not in group (block 3758096384)!
[ 208.316000] EXT3-fs: group descriptors corrupted!
Some more info:
# uname -r
I have fresh new Ubuntu 7.04. My disk is a new Samsung Xtend AdStore XAS3UI500 with 500 GB and USB2. My laptop is a Compaq nx7010 and it supports USB2. `e2fsck -c -c` tells me that there is no physical damage.
A couple of thoughts:
- Can there be data lying around in some cache that gets lost if I unplug the disk too soon after unmounting?
- Should I avoid unplugging the disk when the computer is on?
- (I first thought there could be a problem with putting the computer in suspend mode with the disk mounted. However, I did not suspend before the last file system corruption.)
Why is this happening? I have no clue what the error may be. Any help would be greatly appreciated.