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.
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.