A memória flash USB não está montada após a conexão?

Question

Eu tenho uma unidade USB Trancsend Jetflash TS2GJF210. Quando eu conecto ao meu laptop antigo (Dell Latitude D630) ele não está montado. dmesg mostra as seguintes mensagens:

[108884.154796] usb 2-2: new high-speed USB device number 10 using ehci-pci
[108884.247600] usb 2-2: New USB device found, idVendor=1307, idProduct=1169
[108884.247607] usb 2-2: New USB device strings: Mfr=1, Product=5, SerialNumber=3
[108884.247611] usb 2-2: Product: USB Mass Storage Device
[108884.247615] usb 2-2: Manufacturer: USBest Technology
[108884.247617] usb 2-2: SerialNumber: xxxxxxxxxxxxxx
[108884.248000] usb-storage 2-2:1.0: USB Mass Storage device detected
[108884.248086] scsi10 : usb-storage 2-2:1.0
[108885.248226] scsi 10:0:0:0: Direct-Access     JetFlash TS2GJF210        0.00 PQ: 0 ANSI: 2
[108885.248864] sd 10:0:0:0: Attached scsi generic sg2 type 0
[108885.250964] sd 10:0:0:0: [sdb] 4013568 512-byte logical blocks: (2.05 GB/1.91 GiB)
[108885.253748] sd 10:0:0:0: [sdb] Write Protect is off
[108885.253756] sd 10:0:0:0: [sdb] Mode Sense: 00 00 00 00
[108885.254776] sd 10:0:0:0: [sdb] Asking for cache data failed
[108885.254783] sd 10:0:0:0: [sdb] Assuming drive cache: write through
[108885.259941] sd 10:0:0:0: [sdb] Asking for cache data failed
[108885.259951] sd 10:0:0:0: [sdb] Assuming drive cache: write through
[108885.398908]  sdb: sdb1
[108885.403905] sd 10:0:0:0: [sdb] Asking for cache data failed
[108885.403915] sd 10:0:0:0: [sdb] Assuming drive cache: write through
[108885.403922] sd 10:0:0:0: [sdb] Attached SCSI removable disk
[108885.403922] quiet_error: 126 callbacks suppressed
[108885.403922] Buffer I/O error on device sdb, logical block 501694
[108885.403922] Buffer I/O error on device sdb, logical block 501694
[108885.403922] Buffer I/O error on device sdb, logical block 0
[108885.403922] Buffer I/O error on device sdb, logical block 0
[108885.403922] Buffer I/O error on device sdb, logical block 1
[108885.403922] Buffer I/O error on device sdb, logical block 501695
[108885.403922] Buffer I/O error on device sdb, logical block 1
[108885.403922] Buffer I/O error on device sdb, logical block 1
[108885.403922] Buffer I/O error on device sdb, logical block 501695

e não há entrada sdb no diretório /dev !

Mas se eu desconectar o dispositivo e conectá-lo ao meu outro laptop (Dell Inspiron N4010), o dispositivo será montado corretamente e dmesg será exibido:

[108884.154796] usb 2-1.2: new high-speed USB device number 8 using ehci-pci
[108884.247600] usb 2-1.2: New USB device found, idVendor=1307, idProduct=1169
[108884.247607] usb 2-1.2: New USB device strings: Mfr=1, Product=5, SerialNumber=3
[108884.247611] usb 2-1.2: Product: USB Mass Storage Device
[108884.247615] usb 2-1.2: Manufacturer: USBest Technology
[108884.247617] usb 2-1.2: SerialNumber: xxxxxxxxxxxxxx
[108884.248000] usb-storage 2-1.2:1.0: USB Mass Storage device detected
[108884.248086] scsi22 : usb-storage 2-1.2:1.0
[108885.248226] scsi 22:0:0:0: Direct-Access     JetFlash TS2GJF210        0.00 PQ: 0 ANSI: 2
[108885.248864] sd 22:0:0:0: Attached scsi generic sg2 type 0
[108885.250964] sd 22:0:0:0: [sdb] 4013568 512-byte logical blocks: (2.05 GB/1.91 GiB)
[108885.253748] sd 22:0:0:0: [sdb] Write Protect is off
[108885.253756] sd 22:0:0:0: [sdb] Mode Sense: 00 00 00 00
[108885.254776] sd 22:0:0:0: [sdb] Asking for cache data failed
[108885.254783] sd 22:0:0:0: [sdb] Assuming drive cache: write through
[108885.259941] sd 22:0:0:0: [sdb] Asking for cache data failed
[108885.259951] sd 22:0:0:0: [sdb] Assuming drive cache: write through
[108885.398908]  sdb: sdb1
[108885.403905] sd 22:0:0:0: [sdb] Asking for cache data failed
[108885.403915] sd 22:0:0:0: [sdb] Assuming drive cache: write through
[108885.403922] sd 22:0:0:0: [sdb] Attached SCSI removable disk
[108886.072068] FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.

Eu me cansei muitas vezes de conectá-lo ao laptop de trabalho (N4010) e depois removê-lo após a ejeção (remover com segurança) e reconectar ao D630. Eu até mesmo corro fsck no laptop de trabalho para este dispositivo. Mas o resultado é o mesmo: ele não está montado no laptop D630.

Antes que este problema ocorra (alguns minutos atrás), a unidade flash estava funcionando corretamente em ambos os dispositivos, mas agora ela é montada e funciona somente no N4010.

Ambos os laptops têm o Ubuntu 13.10, o N4010 é atualizado do Ubuntu 13.04 e é atualizado, e o D630 tem uma nova instalação do Ubunut 13.10.

Preciso saber por que esse problema ocorreu e como resolvê-lo.