festplatte nach längerem betrieb tot

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hallo!

vor ein paar wochen hatte ich schonmal probleme mit einer externen festplatte.
damals dachte ich,dass es am verwendeten chipsatz liegt.

nun habe ich mir eine neue festplatte im wechselrahmen gekauft.
d.h. eine western digital wd800 verbaut in einem gehäuse "mobile disk - external data storage",welcher mit dem cypress chipsatz arbeitet.

wenn ich die festplatte über den usb 1 port anschliesse,wird alles erfolgreich erkannt und kann gemountet werden.

nach mehrstündigem betrieb passiert aber nun folgendes:

Nov 21 02:45:21 [kernel]   Vendor: WDC WD80  Model: 0BB-75JHC0        Rev:  0 0
Nov 21 04:39:26 [kernel] SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)
                - Last output repeated twice -
Nov 21 04:42:38 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 199 times -
Nov 21 05:10:52 [kernel] FAT: unable to read inode block for updating (i_pos 613786)
Nov 21 05:10:57 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 140 times -
Nov 21 05:23:27 [kernel] FAT: unable to read inode block for updating (i_pos 613766)
Nov 21 05:23:29 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 23 times -
Nov 21 05:24:12 [kernel] FAT: unable to read inode block for updating (i_pos 613796)
Nov 21 05:24:14 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 59 times -
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38360) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38383) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38406) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38365) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38388) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38411) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38370) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38393) failed
Nov 21 05:46:06 [kernel] FAT: Directory bread(block 38416) failed
Nov 21 05:47:04 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 214 times -
Nov 21 06:11:29 [kernel] printk: 6 messages suppressed.
Nov 21 06:11:29 [kernel] Buffer I/O error on device sda5, logical block 2350856
Nov 21 06:11:35 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 152 times -
Nov 21 06:18:18 [kernel] FAT: unable to read inode block for updating (i_pos 613766)
Nov 21 06:18:19 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 126 times -
Nov 21 06:21:48 [kernel] FAT: unable to read inode block for updating (i_pos 613766)
Nov 21 06:21:50 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 89 times -
Nov 21 06:38:18 [kernel] FAT: unable to read inode block for updating (i_pos 613786)
Nov 21 06:38:19 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 343 times -
.
.
Nov 21 07:05:22 [kernel] FAT: Directory bread(block 38367) failed
Nov 21 07:05:22 [kernel] scsi5 (0:0): rejecting I/O to dead device
Nov 21 07:08:08 [kernel] hub 1-0:1.0: port 1 disabled by hub (EMI?), re-enabling...
Nov 21 07:08:08 [kernel] usb 1-1: new full speed USB device using uhci_hcd and address 9
Nov 21 07:08:08 [kernel] scsi7 : SCSI emulation for USB Mass Storage devices
Nov 21 07:08:09 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 2 times -
Nov 21 07:08:13 [kernel] SCSI device sdb: 156250000 512-byte hdwr sectors (80000 MB)
                - Last output repeated twice -
Nov 21 07:08:13 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 329 times -
Nov 21 07:42:54 [kernel] FAT: Directory bread(block 38423) failed
Nov 21 08:01:43 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 383 times -
Nov 21 09:01:58 [kernel] FAT: unable to read inode block for updating (i_pos 613766)
Nov 21 09:01:59 [kernel] scsi5 (0:0): rejecting I/O to dead device
                - Last output repeated 45 times -

woran kann das liegen? bin für jeden tipp dankbar