External hard disk or USB errors

[Stewart Williams]

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.
-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: kernel-messages.txt
URL: <http://listman.redhat.com/archives/fedora-list/attachments/20081104/431a4131/attachment-0001.txt>