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External hard disk or USB errors



I have an external USB Maxtor OneTouch 160GB hard disk attached to one of my systems and occasionally after the drive has been connected for sometime, randomly it un-mounts and I have to turn it off and on again before I can re-mount it.

The following errors are logged (please see attached file for full log):

...

Nov  4 17:10:21 server1 kernel: usb 5-7: USB disconnect, address 68
Nov  4 17:10:21 server1 kernel: Buffer I/O error on device sda5, logical
block 731
Nov  4 17:10:21 server1 kernel: lost page write due to I/O error on sda5
Nov  4 17:10:21 server1 kernel: Aborting journal on device sda5.
Nov  4 17:10:21 server1 kernel: journal commit I/O error
Nov  4 17:10:21 server1 kernel: Buffer I/O error on device sda5, logical
block 11
Nov  4 17:10:21 server1 kernel: lost page write due to I/O error on sda5
Nov  4 17:10:21 server1 kernel: usb 5-7: new high speed USB device using
ehci_hcd and address 69
Nov  4 17:10:21 server1 kernel: usb 5-7: configuration #1 chosen from 1
choice
Nov  4 17:10:21 server1 kernel: scsi190 : SCSI emulation for USB Mass
Storage devices
Nov  4 17:10:21 server1 kernel: usb-storage: device found at 69
Nov  4 17:10:21 server1 kernel: usb-storage: waiting for device to
settle before scanning

...

Can anyone shine any light on wether it's a power, USB, hard disk (failure pending?) or some other problem.

It only does now and again; but it is of concern.

Many Thanks.
Nov  4 08:53:53 server1 kernel: usb 5-7: USB disconnect, address 67
Nov  4 08:54:08 server1 kernel: usb 5-7: new high speed USB device using
ehci_hcd and address 68
Nov  4 08:54:08 server1 kernel: usb 5-7: configuration #1 chosen from 1
choice
Nov  4 08:54:08 server1 kernel: scsi189 : SCSI emulation for USB Mass
Storage devices
Nov  4 08:54:08 server1 kernel: usb-storage: device found at 68
Nov  4 08:54:08 server1 kernel: usb-storage: waiting for device to
settle before scanning
Nov  4 08:54:13 server1 kernel: scsi 189:0:0:0: Direct-Access     Maxtor
  OneTouch         0201 PQ: 0 ANSI: 0 CCS
Nov  4 08:54:13 server1 kernel: sd 189:0:0:0: [sda] 240119808 512-byte
hardware sectors (122941 MB)
Nov  4 08:54:13 server1 kernel: sd 189:0:0:0: [sda] Write Protect is off
Nov  4 08:54:13 server1 kernel: sd 189:0:0:0: [sda] Mode Sense: 1c 00 00 00
Nov  4 08:54:13 server1 kernel: sd 189:0:0:0: [sda] Assuming drive
cache: write through
Nov  4 08:54:13 server1 kernel: sd 189:0:0:0: [sda] 240119808 512-byte
hardware sectors (122941 MB)
Nov  4 08:54:14 server1 kernel: sd 189:0:0:0: [sda] Write Protect is off
Nov  4 08:54:14 server1 kernel: sd 189:0:0:0: [sda] Mode Sense: 1c 00 00 00
Nov  4 08:54:14 server1 kernel: sd 189:0:0:0: [sda] Assuming drive
cache: write through
Nov  4 08:54:14 server1 kernel:  sda: sda1 < sda5 >
Nov  4 08:54:14 server1 kernel: sd 189:0:0:0: [sda] Attached SCSI disk
Nov  4 08:54:14 server1 kernel: usb-storage: device scan complete
Nov  4 09:00:08 server1 kernel: kjournald starting.  Commit interval 5
seconds
Nov  4 09:00:08 server1 kernel: EXT3-fs warning: maximal mount count
reached, running e2fsck is recommended
Nov  4 09:00:08 server1 kernel: EXT3 FS on sda5, internal journal
Nov  4 09:00:08 server1 kernel: EXT3-fs: mounted filesystem with ordered
data mode.
Nov  4 17:10:21 server1 kernel: usb 5-7: USB disconnect, address 68
Nov  4 17:10:21 server1 kernel: Buffer I/O error on device sda5, logical
block 731
Nov  4 17:10:21 server1 kernel: lost page write due to I/O error on sda5
Nov  4 17:10:21 server1 kernel: Aborting journal on device sda5.
Nov  4 17:10:21 server1 kernel: journal commit I/O error
Nov  4 17:10:21 server1 kernel: Buffer I/O error on device sda5, logical
block 11
Nov  4 17:10:21 server1 kernel: lost page write due to I/O error on sda5
Nov  4 17:10:21 server1 kernel: usb 5-7: new high speed USB device using
ehci_hcd and address 69
Nov  4 17:10:21 server1 kernel: usb 5-7: configuration #1 chosen from 1
choice
Nov  4 17:10:21 server1 kernel: scsi190 : SCSI emulation for USB Mass
Storage devices
Nov  4 17:10:21 server1 kernel: usb-storage: device found at 69
Nov  4 17:10:21 server1 kernel: usb-storage: waiting for device to
settle before scanning
Nov  4 17:10:26 server1 kernel: scsi 190:0:0:0: Direct-Access     Maxtor
  OneTouch         0201 PQ: 0 ANSI: 0 CCS
Nov  4 17:10:26 server1 kernel: sd 190:0:0:0: [sdb] 240119808 512-byte
hardware sectors (122941 MB)
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] Write Protect is off
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] Mode Sense: 1c 00 00 00
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] Assuming drive
cache: write through
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] 240119808 512-byte
hardware sectors (122941 MB)
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] Write Protect is off
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] Mode Sense: 1c 00 00 00
Nov  4 17:10:27 server1 kernel: sd 190:0:0:0: [sdb] Assuming drive
cache: write through
Nov  4 17:10:32 server1 kernel:  sdb: sdb1 < sdb5 >
Nov  4 17:10:32 server1 kernel: sd 190:0:0:0: [sdb] Attached SCSI disk
Nov  4 17:10:32 server1 kernel: usb-storage: device scan complete
Nov  4 17:32:06 server1 kernel: scsi 189:0:0:0: rejecting I/O to dead device
Nov  4 17:32:06 server1 kernel: Buffer I/O error on device sda5, logical
block 523
Nov  4 17:32:06 server1 kernel: EXT3-fs error (device sda5):
ext3_readdir: directory #2 contains a hole at offset 0
Nov  4 17:32:06 server1 kernel: scsi 189:0:0:0: rejecting I/O to dead device
Nov  4 17:32:06 server1 kernel: Buffer I/O error on device sda5, logical
block 0
Nov  4 17:32:06 server1 kernel: lost page write due to I/O error on sda5
Nov  4 17:32:06 server1 kernel: ext3_abort called.
Nov  4 17:32:06 server1 kernel: EXT3-fs error (device sda5):
ext3_journal_start_sb: Detected aborted journal
Nov  4 17:32:06 server1 kernel: Remounting filesystem read-only
Nov  4 17:32:47 server1 kernel: scsi 189:0:0:0: rejecting I/O to dead device
Nov  4 17:32:47 server1 kernel: EXT3-fs error (device sda5):
ext3_readdir: directory #2 contains a hole at offset 0
Nov  4 17:34:59 server1 kernel: usb 5-7: USB disconnect, address 69
Nov  4 17:35:10 server1 kernel: usb 5-7: new high speed USB device using
ehci_hcd and address 70
Nov  4 17:35:10 server1 kernel: usb 5-7: configuration #1 chosen from 1
choice
Nov  4 17:35:10 server1 kernel: scsi191 : SCSI emulation for USB Mass
Storage devices
Nov  4 17:35:10 server1 kernel: usb-storage: device found at 70
Nov  4 17:35:10 server1 kernel: usb-storage: waiting for device to
settle before scanning
Nov  4 17:35:15 server1 kernel: scsi 191:0:0:0: Direct-Access     Maxtor
  OneTouch         0201 PQ: 0 ANSI: 0 CCS
Nov  4 17:35:15 server1 kernel: sd 191:0:0:0: [sdb] 240119808 512-byte
hardware sectors (122941 MB)
Nov  4 17:35:15 server1 kernel: sd 191:0:0:0: [sdb] Write Protect is off
Nov  4 17:35:15 server1 kernel: sd 191:0:0:0: [sdb] Mode Sense: 1c 00 00 00
Nov  4 17:35:15 server1 kernel: sd 191:0:0:0: [sdb] Assuming drive
cache: write through
Nov  4 17:35:15 server1 kernel: sd 191:0:0:0: [sdb] 240119808 512-byte
hardware sectors (122941 MB)
Nov  4 17:35:16 server1 kernel: sd 191:0:0:0: [sdb] Write Protect is off
Nov  4 17:35:16 server1 kernel: sd 191:0:0:0: [sdb] Mode Sense: 1c 00 00 00
Nov  4 17:35:16 server1 kernel: sd 191:0:0:0: [sdb] Assuming drive
cache: write through
Nov  4 17:35:16 server1 kernel:  sdb: sdb1 < sdb5 >
Nov  4 17:35:16 server1 kernel: sd 191:0:0:0: [sdb] Attached SCSI disk
Nov  4 17:35:16 server1 kernel: usb-storage: device scan complete
Nov  4 17:36:40 server1 kernel: kjournald starting.  Commit interval 5
seconds
Nov  4 17:36:40 server1 kernel: EXT3-fs warning: maximal mount count
reached, running e2fsck is recommended
Nov  4 17:36:40 server1 kernel: EXT3 FS on sdb5, internal journal
Nov  4 17:36:40 server1 kernel: EXT3-fs: recovery complete.
Nov  4 17:36:40 server1 kernel: EXT3-fs: mounted filesystem with ordered
data mode.
Nov  4 21:23:50 server1 kernel: kjournald starting.  Commit interval 5
seconds
Nov  4 21:23:50 server1 kernel: EXT3 FS on sdb5, internal journal
Nov  4 21:23:50 server1 kernel: EXT3-fs: mounted filesystem with ordered
data mode.

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