External USB drive disconnecting itself.

[Chris Ruprecht]

Hello,

I have two external USB drives connected to a FC6 machine. Under heavy 
load (like gzipping a large file), the drive disconnects itself. I have 
this message in my syslog:

Nov 12 19:09:00 jupiter kernel: SCSI error : <3 0 0 0> return code = 0x10000
Nov 12 19:09:00 jupiter kernel: end_request: I/O error, dev sdh, sector 
33039
Nov 12 19:09:00 jupiter kernel: scsi3 (0:0): rejecting I/O to device 
being removed
Nov 12 19:09:00 jupiter kernel: Buffer I/O error on device sdh1, logical 
block 4124
Nov 12 19:09:00 jupiter kernel: lost page write due to I/O error on sdh1
Nov 12 19:09:00 jupiter kernel: Aborting journal on device sdh1.
Nov 12 19:09:00 jupiter kernel: ext3_abort called.
Nov 12 19:09:00 jupiter kernel: EXT3-fs error (device sdh1): 
ext3_journal_start_sb: Detected aborted journal
Nov 12 19:09:00 jupiter kernel: Remounting filesystem read-only
Nov 12 19:09:00 jupiter kernel: scsi3 (0:0): rejecting I/O to device 
being removed
Nov 12 19:09:00 jupiter kernel: sdh : READ CAPACITY failed.
Nov 12 19:09:00 jupiter kernel: sdh : status=0, message=00, host=1, 
driver=00
Nov 12 19:09:00 jupiter kernel: sdh : sense not available.
Nov 12 19:09:00 jupiter kernel: sdh: Write Protect is off
Nov 12 19:09:00 jupiter kernel: sdh: assuming drive cache: write through
Nov 12 19:09:00 jupiter kernel: scsi3 (0:0): rejecting I/O to device 
being removed
Nov 12 19:09:00 jupiter kernel: Buffer I/O error on device sdh1, logical 
block 1046
Nov 12 19:09:00 jupiter kernel: lost page write due to I/O error on sdh1
Nov 12 19:09:00 jupiter kernel: usb 1-6: new high speed USB device using 
address 4
Nov 12 19:09:00 jupiter kernel: scsi4 : SCSI emulation for USB Mass 
Storage devices
Nov 12 19:09:00 jupiter fstab-sync[6975]: removed mount point 
/media/pubbackup for /dev/sdh1

I have tried two different adaptors, makes no difference. It only works, 
if I hook up the external drive to the motherboard USB port, but that's 
USB 1.1 - unusable for this purpose.

Any ideas?
Thanks,
Chris