One of my usb-disks shows this problem - read-only after mouting. Others
works fine.
Messages in /var/log/syslog told about FS errors on this drive:
Jul 19 19:10:34 sgx kernel: [265194.548110] usb 2-3: new high speed USB device
using ehci_hcd and address 25
Jul 19 19:10:34 sgx kernel: [265194.682177] usb 2-3: configuration #1 chosen
from 1 choice
Jul 19 19:10:34 sgx kernel: [265194.683266] scsi26 : SCSI emulation for USB
Mass Storage devices
Jul 19 19:10:34 sgx kernel: [265194.683490] usb-storage: device found at 25
Jul 19 19:10:34 sgx kernel: [265194.683496] usb-storage: waiting for device to
settle before scanning
Jul 19 19:10:39 sgx kernel: [265199.680456] usb-storage: device scan complete
Jul 19 19:10:39 sgx kernel: [265199.681273] scsi 26:0:0:0: Direct-Access
A-DATA USB Flash Drive 0.00 PQ: 0 ANSI: 2
Jul 19 19:10:39 sgx kernel: [265199.682661] sd 26:0:0:0: Attached scsi generic
sg2 type 0
Jul 19 19:10:39 sgx kernel: [265199.684457] sd 26:0:0:0: [sdb] 15794176
512-byte logical blocks: (8.08 GB/7.53 GiB)
Jul 19 19:10:39 sgx kernel: [265199.689603] sd 26:0:0:0: [sdb] Write Protect is
off
Jul 19 19:10:39 sgx kernel: [265199.689608] sd 26:0:0:0: [sdb] Mode Sense: 00
00 00 00
Jul 19 19:10:39 sgx kernel: [265199.689611] sd 26:0:0:0: [sdb] Assuming drive
cache: write through
Jul 19 19:10:39 sgx kernel: [265199.692426] sd 26:0:0:0: [sdb] Assuming drive
cache: write through
Jul 19 19:10:39 sgx kernel: [265199.692433] sdb: sdb1
Jul 19 19:10:39 sgx kernel: [265199.965582] sd 26:0:0:0: [sdb] Assuming drive
cache: write through
Jul 19 19:10:39 sgx kernel: [265199.965593] sd 26:0:0:0: [sdb] Attached SCSI
removable disk
Jul 19 19:10:40 sgx kernel: [265200.655407] FAT: Filesystem error (dev sdb1)
Jul 19 19:10:40 sgx kernel: [265200.655411] fat_get_cluster: invalid
cluster chain (i_pos 0)
Jul 19 19:10:40 sgx kernel: [265200.655416] File system has been set
read-only
^^^^^^^^^^^^^^^^^^^^^^^^^
Normal mount was restored after format bad drive.
--
Ubuntu 10.04 - VFAT usb drives mount with root access only
https://bugs.launchpad.net/bugs/573981
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