It happened again - the directory comes up as blank, and the icon for the flash drive won't unmount.
Here's what I get in /var/log/messages:
Feb 26 12:43:46 localhost kernel: usb 1-8: new high speed USB device using address 15 Feb 26 12:43:46 localhost kernel: scsi13 : SCSI emulation for USB Mass Storage devices Feb 26 12:43:46 localhost kernel: Vendor: SanDisk Model: U3 Titanium Rev: 2.18 Feb 26 12:43:46 localhost kernel: Type: Direct-Access ANSI SCSI revision: 02 Feb 26 12:43:46 localhost kernel: SCSI device sdb: 4013713 512-byte hdwr sectors (2055 MB) Feb 26 12:43:46 localhost kernel: sdb: Write Protect is off Feb 26 12:43:46 localhost kernel: sdb: assuming drive cache: write through Feb 26 12:43:46 localhost kernel: SCSI device sdb: 4013713 512-byte hdwr sectors (2055 MB) Feb 26 12:43:46 localhost kernel: sdb: Write Protect is off Feb 26 12:43:46 localhost kernel: sdb: assuming drive cache: write through Feb 26 12:43:46 localhost kernel: sdb: unknown partition table Feb 26 12:43:46 localhost kernel: Attached scsi removable disk sdb at scsi13, channel 0, id 0, lun 0 Feb 26 12:43:46 localhost scsi.agent[10634]: disk at /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/host13/target13:0:0/13 :0:0:0 Feb 26 12:43:47 localhost fstab-sync[10710]: added mount point /media/MHRTITAN for /dev/sdb
It seems that the partition table is not being recognized....
It mounts fine on my Windows XP under VMWare on the same machine.
-----Original Message----- From: centos-bounces@centos.org [mailto:centos-bounces@centos.org] On Behalf Of Ralph Angenendt Sent: Sunday, February 25, 2007 3:31 AM To: centos@centos.org Subject: Re: [CentOS] USB flash drive stopped working properly....
Mark Hull-Richter wrote:
Is there some time limit on how long a USB flash drive will work in CentOS or is this a bug or ? ? ?
Actual error messages (dmesg or /var/log/messages) really would be better for identifying the problem then telling us who made the stick
:)
Cheers,
Ralph
Mark Hull-Richter wrote:
It happened again - the directory comes up as blank, and the icon for the flash drive won't unmount.
Here's what I get in /var/log/messages:
Feb 26 12:43:46 localhost kernel: usb 1-8: new high speed USB device using address 15 Feb 26 12:43:46 localhost kernel: scsi13 : SCSI emulation for USB Mass Storage devices Feb 26 12:43:46 localhost kernel: Vendor: SanDisk Model: U3 Titanium Rev: 2.18 Feb 26 12:43:46 localhost kernel: Type: Direct-Access ANSI SCSI revision: 02 Feb 26 12:43:46 localhost kernel: SCSI device sdb: 4013713 512-byte hdwr sectors (2055 MB) Feb 26 12:43:46 localhost kernel: sdb: Write Protect is off Feb 26 12:43:46 localhost kernel: sdb: assuming drive cache: write through Feb 26 12:43:46 localhost kernel: SCSI device sdb: 4013713 512-byte hdwr sectors (2055 MB) Feb 26 12:43:46 localhost kernel: sdb: Write Protect is off Feb 26 12:43:46 localhost kernel: sdb: assuming drive cache: write through Feb 26 12:43:46 localhost kernel: sdb: unknown partition table Feb 26 12:43:46 localhost kernel: Attached scsi removable disk sdb at scsi13, channel 0, id 0, lun 0 Feb 26 12:43:46 localhost scsi.agent[10634]: disk at /devices/pci0000:00/0000:00:1d.7/usb1/1-8/1-8:1.0/host13/target13:0:0/13 :0:0:0 Feb 26 12:43:47 localhost fstab-sync[10710]: added mount point /media/MHRTITAN for /dev/sdb
It seems that the partition table is not being recognized....
It mounts fine on my Windows XP under VMWare on the same machine.
Next time, dd if=/dev/sda count=1 | xxd | less
I don't propose to decode the partition table (I could, but it would take me longer than I'd do free), but I suspect that the invalid partition table will be clearly wrong, maybe all binary zeros.
To see what a good partition table looks like, dump /dev/hda or some other.
The important stuff is here:
00001b0: 0000 0000 0000 0000 39cb 0200 0000 0001 ........9....... 00001c0: 0100 83fe 3f02 3f00 0000 04bc 0000 8000 ....?.?......... 00001d0: 0103 06fe 3f04 43bc 0000 827d 0000 0000 ....?.C....}.... 00001e0: 0105 83fe ffff c539 0100 3f14 a804 00fe .......9..?..... 00001f0: ffff 05fe ffff 044e a904 00a6 5009 55aa .......N....P.U.
and the 55aa at the end is crucial: if that's not 55aa, nothing else matters.
btw I suggest using dd to take a full copy while it's working. If necessary, you can play with parted, extract the bits and gain an education later.
Mark Hull-Richter wrote:
Feb 26 12:43:46 localhost kernel: Vendor: SanDisk Model: U3 Titanium
^^
Feb 26 12:43:46 localhost kernel: sdb: unknown partition table
Is this U3 stick password protected in some way? Can you try to mount /dev/sdb as a cdrom device? Like "mount -t iso9660 /dev/sdb/ /mnt/mountpoint" (mkdir /mnt/mountpoint first)?
If so: Congratulations, you bought yourself windows hardware.
Ralph
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John Summerfield -
Mark Hull-Richter -
Ralph Angenendt