SCSI : Ecriture pas stable

Bonjour,

J'ai un problème avec l'émulation SCSI. Quand je connecte mon disque externe sur le port usb, tant que c'est en lecture, ça se passe à merveille (à part que je dois le monter manuellement sous kde et que ça se fait tout seul sous gnome)- Mais pour écrire des fichiers, ça marche 2 secondes et puis plantage.
Pour info voici des logs :

When it is not working
to device being removed
scsi0 (0:0): rejecting I/O to device being removed
scsi0 (0:0): rejecting I/O to device being removed
....
....
scsi0 (0:0): rejecting I/O to dead device
FAT bread failed in fat_clusters_flush
usb-storage: Error in device_reset: invalid state 135007670
usb-storage: Error in bus_reset: invalid state 135007670
scsi: Device offlined - not ready after error recovery: host 0 channel 0 id 0 lun 0
0:0:0:0: Illegal state transition deleted->offline
Badness in scsi_device_set_state at drivers/scsi/scsi_lib.c:1643
[] scsi_device_set_state+0xc9/0x120 [scsi_mod]
[] scsi_eh_offline_sdevs+0x6e/0x90 [scsi_mod]
[] scsi_unjam_host+0xcc/0x210 [scsi_mod]
[] default_wake_function+0x0/0x20
[] scsi_error_handler+0x108/0x1c0 [scsi_mod]
[] scsi_error_handler+0x0/0x1c0 [scsi_mod]
[] kernel_thread_helper+0x5/0x18

Et ce que dit le syslog....
Feb 7 22:28:44 localhost kernel: ^ISense class 0, sense error 0, extended sense 0
Feb 7 22:28:44 localhost kernel: scsi0 (0:0): rejecting I/O to device being removed
Feb 7 22:28:44 localhost last message repeated 45 times
Feb 7 22:28:44 localhost kernel: scsi0 (0:0): rejec device being removed
Feb 7 22:28:44 localhost kernel: scsi0 (0:0): rejecting I/O to device being removed
Feb 7 22:28:44 localhost last message repeated 302 times
Feb 7 22:28:50 localhost kernel: scsi0 (0:0): rejecting I/O to dead device
Feb 7 22:28:50 localhost kernel: FAT bread failed in fat_clusters_flush
Feb 7 22:29:13 localhost kernel: usb-storage: Error in device_reset: invalid state 135007670
Feb 7 22:29:13 localhost kernel: usb-storage: Error in bus_reset: invalid state 135007670
Feb 7 22:29:13 localhost kernel: scsi: Device offlined - not ready after error recovery: host 0 channel 0 id 0 lun 0
Feb 7 22:29:13 localhost kernel: 0:0:0:0: Illegal state transition deleted->offline
Feb 7 22:29:13 localhost kernel: Badness in scsi_device_set_state at drivers/scsi/scsi_lib.c:1643
Feb 7 22:29:13 localhost kernel: [__crc_sb_min_blocksize+274935/3938492] scsi_device_set_state+0xc9/0x120 [scsi_mod]
Feb 7 22:29:13 localhost kernel: [__crc_sb_min_blocksize+264972/3938492] scsi_eh_offline_sdevs+0x6e/0x90 [scsi_mod]
Feb 7 22:29:13 localhost kernel: [__crc_sb_min_blocksize+266586/3938492] scsi_unjam_host+0xcc/0x210 [scsi_mod]
Feb 7 22:29:13 localhost kernel: [default_wake_function+0/32] default_wake_function+0x0/0x20
Feb 7 22:29:13 localhost kernel: [__crc_sb_min_blocksize+267174/3938492] scsi_error_handler+0x108/0x1c0 [scsi_mod]
Feb 7 22:29:13 localhost kernel: [__crc_sb_min_blocksize+266910/3938492] scsi_error_handler+0x0/0x1c0 [scsi_mod]
Feb 7 22:29:13 localhost kernel: [kernel_thread_helper+5/24] kernel_thread_helper+0x5/0x18

Voilà, si qq'un peut faire qq chose avec ça j'en serai ravi.

Merci