grazie mauro
questo è l'output di dmesg
[ 2254.267447] usb 1-2: new high-speed USB device number 5 using xhci_hcd
[ 2254.396376] usb 1-2: New USB device found, idVendor=18a5, idProduct=022b
[ 2254.396380] usb 1-2: New USB device strings: Mfr=10, Product=11, SerialNumber=12
[ 2254.396381] usb 1-2: Product: Portable USB Drive
[ 2254.396383] usb 1-2: Manufacturer: Verbatim
[ 2254.396384] usb 1-2: SerialNumber: 295004258976
[ 2254.524972] usb-storage 1-2:1.0: USB Mass Storage device detected
[ 2254.525043] scsi2 : usb-storage 1-2:1.0
[ 2254.525124] usbcore: registered new interface driver usb-storage
[ 2255.525022] scsi 2:0:0:0: Direct-Access SAMSUNG HM321HI PQ: 0 ANSI: 2 CCS
[ 2255.525796] sd 2:0:0:0: [sdb] 625142448 512-byte logical blocks: (320 GB/298 GiB)
[ 2255.525852] sd 2:0:0:0: Attached scsi generic sg2 type 0
[ 2255.526072] sd 2:0:0:0: [sdb] Write Protect is off
[ 2255.526079] sd 2:0:0:0: [sdb] Mode Sense: 28 00 00 00
[ 2255.526314] sd 2:0:0:0: [sdb] No Caching mode page found
[ 2255.526320] sd 2:0:0:0: [sdb] Assuming drive cache: write through
[ 2255.548320] sdb: sdb1
[ 2255.549329] sd 2:0:0:0: [sdb] Attached SCSI disk
[ 2257.967867] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2257.967871] sd 2:0:0:0: [sdb]
[ 2257.967872] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2257.967874] sd 2:0:0:0: [sdb]
[ 2257.967875] Sense Key : Medium Error [current]
[ 2257.967877] sd 2:0:0:0: [sdb]
[ 2257.967879] Add. Sense: Unrecovered read error
[ 2257.967881] sd 2:0:0:0: [sdb] CDB:
[ 2257.967882] Read(10): 28 00 00 00 00 38 00 00 08 00
[ 2257.967887] end_request: critical medium error, dev sdb, sector 56
[ 2257.967891] Buffer I/O error on device sdb, logical block 7
[ 2260.344651] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2260.344655] sd 2:0:0:0: [sdb]
[ 2260.344659] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2260.344661] sd 2:0:0:0: [sdb]
[ 2260.344662] Sense Key : Medium Error [current]
[ 2260.344664] sd 2:0:0:0: [sdb]
[ 2260.344666] Add. Sense: Unrecovered read error
[ 2260.344667] sd 2:0:0:0: [sdb] CDB:
[ 2260.344668] Read(10): 28 00 00 00 00 38 00 00 08 00
[ 2260.344674] end_request: critical medium error, dev sdb, sector 56
[ 2260.344678] Buffer I/O error on device sdb, logical block 7
[ 2262.743603] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2262.743606] sd 2:0:0:0: [sdb]
[ 2262.743608] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2262.743609] sd 2:0:0:0: [sdb]
[ 2262.743610] Sense Key : Medium Error [current]
[ 2262.743613] sd 2:0:0:0: [sdb]
[ 2262.743615] Add. Sense: Unrecovered read error
[ 2262.743616] sd 2:0:0:0: [sdb] CDB:
[ 2262.743617] Read(10): 28 00 00 00 00 3f 00 00 08 00
[ 2262.743623] end_request: critical medium error, dev sdb, sector 63
[ 2262.743626] Buffer I/O error on device sdb1, logical block 0
[ 2262.743629] Buffer I/O error on device sdb1, logical block 1
[ 2262.743630] Buffer I/O error on device sdb1, logical block 2
[ 2262.743632] Buffer I/O error on device sdb1, logical block 3
[ 2262.743633] Buffer I/O error on device sdb1, logical block 4
[ 2262.743634] Buffer I/O error on device sdb1, logical block 5
[ 2262.743635] Buffer I/O error on device sdb1, logical block 6
[ 2262.743637] Buffer I/O error on device sdb1, logical block 7
[ 2265.142507] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2265.142511] sd 2:0:0:0: [sdb]
[ 2265.142512] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2265.142514] sd 2:0:0:0: [sdb]
[ 2265.142515] Sense Key : Medium Error [current]
[ 2265.142517] sd 2:0:0:0: [sdb]
[ 2265.142519] Add. Sense: Unrecovered read error
[ 2265.142520] sd 2:0:0:0: [sdb] CDB:
[ 2265.142521] Read(10): 28 00 00 00 00 3f 00 00 01 00
[ 2265.142527] end_request: critical medium error, dev sdb, sector 63
[ 2267.519313] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2267.519317] sd 2:0:0:0: [sdb]
[ 2267.519319] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2267.519320] sd 2:0:0:0: [sdb]
[ 2267.519321] Sense Key : Medium Error [current]
[ 2267.519324] sd 2:0:0:0: [sdb]
[ 2267.519325] Add. Sense: Unrecovered read error
[ 2267.519327] sd 2:0:0:0: [sdb] CDB:
[ 2267.519328] Read(10): 28 00 00 00 00 40 00 00 07 00
[ 2267.519334] end_request: critical medium error, dev sdb, sector 64
[ 2267.519336] quiet_error: 1 callbacks suppressed
[ 2267.519338] Buffer I/O error on device sdb1, logical block 1
[ 2267.519341] Buffer I/O error on device sdb1, logical block 2
[ 2267.519342] Buffer I/O error on device sdb1, logical block 3
[ 2267.519343] Buffer I/O error on device sdb1, logical block 4
[ 2267.519345] Buffer I/O error on device sdb1, logical block 5
[ 2267.519346] Buffer I/O error on device sdb1, logical block 6
[ 2267.519347] Buffer I/O error on device sdb1, logical block 7
[ 2603.754957] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2603.754966] sd 2:0:0:0: [sdb]
[ 2603.754970] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2603.754974] sd 2:0:0:0: [sdb]
[ 2603.754977] Sense Key : Medium Error [current]
[ 2603.754983] sd 2:0:0:0: [sdb]
[ 2603.754988] Add. Sense: Unrecovered read error
[ 2603.754992] sd 2:0:0:0: [sdb] CDB:
[ 2603.754994] Read(10): 28 00 00 00 00 3f 00 00 20 00
[ 2603.755010] end_request: critical medium error, dev sdb, sector 63
[ 2603.755018] Buffer I/O error on device sdb1, logical block 0
[ 2603.755024] Buffer I/O error on device sdb1, logical block 1
[ 2603.755028] Buffer I/O error on device sdb1, logical block 2
[ 2603.755031] Buffer I/O error on device sdb1, logical block 3
[ 2603.755034] Buffer I/O error on device sdb1, logical block 4
[ 2603.755038] Buffer I/O error on device sdb1, logical block 5
[ 2603.755042] Buffer I/O error on device sdb1, logical block 6
[ 2603.755046] Buffer I/O error on device sdb1, logical block 7
[ 2603.755054] Buffer I/O error on device sdb1, logical block 8
[ 2603.755057] Buffer I/O error on device sdb1, logical block 9
[ 2606.186671] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2606.186680] sd 2:0:0:0: [sdb]
[ 2606.186684] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2606.186688] sd 2:0:0:0: [sdb]
[ 2606.186691] Sense Key : Medium Error [current]
[ 2606.186697] sd 2:0:0:0: [sdb]
[ 2606.186702] Add. Sense: Unrecovered read error
[ 2606.186706] sd 2:0:0:0: [sdb] CDB:
[ 2606.186709] Read(10): 28 00 00 00 00 3f 00 00 01 00
[ 2606.186724] end_request: critical medium error, dev sdb, sector 63
[ 2608.563459] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2608.563463] sd 2:0:0:0: [sdb]
[ 2608.563465] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2608.563467] sd 2:0:0:0: [sdb]
[ 2608.563468] Sense Key : Medium Error [current]
[ 2608.563471] sd 2:0:0:0: [sdb]
[ 2608.563473] Add. Sense: Unrecovered read error
[ 2608.563475] sd 2:0:0:0: [sdb] CDB:
[ 2608.563476] Read(10): 28 00 00 00 00 40 00 00 01 00
[ 2608.563483] end_request: critical medium error, dev sdb, sector 64
[ 2610.940241] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2610.940245] sd 2:0:0:0: [sdb]
[ 2610.940247] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2610.940248] sd 2:0:0:0: [sdb]
[ 2610.940249] Sense Key : Medium Error [current]
[ 2610.940252] sd 2:0:0:0: [sdb]
[ 2610.940253] Add. Sense: Unrecovered read error
[ 2610.940255] sd 2:0:0:0: [sdb] CDB:
[ 2610.940256] Read(10): 28 00 00 00 00 41 00 00 06 00
[ 2610.940262] end_request: critical medium error, dev sdb, sector 65
[ 2610.940264] quiet_error: 24 callbacks suppressed
[ 2610.940266] Buffer I/O error on device sdb1, logical block 2
[ 2610.940269] Buffer I/O error on device sdb1, logical block 3
[ 2610.940270] Buffer I/O error on device sdb1, logical block 4
[ 2610.940271] Buffer I/O error on device sdb1, logical block 5
[ 2610.940273] Buffer I/O error on device sdb1, logical block 6
[ 2610.940274] Buffer I/O error on device sdb1, logical block 7
[ 2613.317111] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2613.317121] sd 2:0:0:0: [sdb]
[ 2613.317125] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2613.317129] sd 2:0:0:0: [sdb]
[ 2613.317132] Sense Key : Medium Error [current]
[ 2613.317138] sd 2:0:0:0: [sdb]
[ 2613.317143] Add. Sense: Unrecovered read error
[ 2613.317147] sd 2:0:0:0: [sdb] CDB:
[ 2613.317150] Read(10): 28 00 00 00 00 3f 00 00 01 00
[ 2613.317165] end_request: critical medium error, dev sdb, sector 63
[ 2613.317173] Buffer I/O error on device sdb1, logical block 0
[ 2615.693860] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2615.693864] sd 2:0:0:0: [sdb]
[ 2615.693866] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2615.693867] sd 2:0:0:0: [sdb]
[ 2615.693868] Sense Key : Medium Error [current]
[ 2615.693871] sd 2:0:0:0: [sdb]
[ 2615.693873] Add. Sense: Unrecovered read error
[ 2615.693874] sd 2:0:0:0: [sdb] CDB:
[ 2615.693875] Read(10): 28 00 00 00 00 40 00 00 01 00
[ 2615.693881] end_request: critical medium error, dev sdb, sector 64
[ 2615.693884] Buffer I/O error on device sdb1, logical block 1
[ 2618.070798] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2618.070807] sd 2:0:0:0: [sdb]
[ 2618.070811] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2618.070815] sd 2:0:0:0: [sdb]
[ 2618.070818] Sense Key : Medium Error [current]
[ 2618.070824] sd 2:0:0:0: [sdb]
[ 2618.070829] Add. Sense: Unrecovered read error
[ 2618.070833] sd 2:0:0:0: [sdb] CDB:
[ 2618.070836] Read(10): 28 00 00 00 00 41 00 00 06 00
[ 2618.070851] end_request: critical medium error, dev sdb, sector 65
[ 2618.070858] Buffer I/O error on device sdb1, logical block 2
[ 2618.070864] Buffer I/O error on device sdb1, logical block 3
[ 2618.070868] Buffer I/O error on device sdb1, logical block 4
[ 2618.070871] Buffer I/O error on device sdb1, logical block 5
[ 2618.070875] Buffer I/O error on device sdb1, logical block 6
[ 2618.070878] Buffer I/O error on device sdb1, logical block 7
[ 2620.447469] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2620.447482] sd 2:0:0:0: [sdb]
[ 2620.447489] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2620.447495] sd 2:0:0:0: [sdb]
[ 2620.447500] Sense Key : Medium Error [current]
[ 2620.447509] sd 2:0:0:0: [sdb]
[ 2620.447517] Add. Sense: Unrecovered read error
[ 2620.447524] sd 2:0:0:0: [sdb] CDB:
[ 2620.447528] Read(10): 28 00 00 00 00 3f 00 00 08 00
[ 2620.447552] end_request: critical medium error, dev sdb, sector 63
[ 2620.447562] Buffer I/O error on device sdb1, logical block 0
[ 2620.447572] Buffer I/O error on device sdb1, logical block 1
[ 2620.447578] Buffer I/O error on device sdb1, logical block 2
[ 2620.447584] Buffer I/O error on device sdb1, logical block 3
[ 2622.824289] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2622.824293] sd 2:0:0:0: [sdb]
[ 2622.824295] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2622.824297] sd 2:0:0:0: [sdb]
[ 2622.824298] Sense Key : Medium Error [current]
[ 2622.824301] sd 2:0:0:0: [sdb]
[ 2622.824303] Add. Sense: Unrecovered read error
[ 2622.824305] sd 2:0:0:0: [sdb] CDB:
[ 2622.824306] Read(10): 28 00 00 00 00 3f 00 00 01 00
[ 2622.824313] end_request: critical medium error, dev sdb, sector 63
[ 2625.201171] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2625.201180] sd 2:0:0:0: [sdb]
[ 2625.201184] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2625.201188] sd 2:0:0:0: [sdb]
[ 2625.201190] Sense Key : Medium Error [current]
[ 2625.201197] sd 2:0:0:0: [sdb]
[ 2625.201202] Add. Sense: Unrecovered read error
[ 2625.201206] sd 2:0:0:0: [sdb] CDB:
[ 2625.201209] Read(10): 28 00 00 00 00 40 00 00 01 00
[ 2625.201224] end_request: critical medium error, dev sdb, sector 64
[ 2625.201230] quiet_error: 5 callbacks suppressed
[ 2625.201235] Buffer I/O error on device sdb1, logical block 1
[ 2627.577974] sd 2:0:0:0: [sdb] Unhandled sense code
[ 2627.577983] sd 2:0:0:0: [sdb]
[ 2627.577987] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE
[ 2627.577991] sd 2:0:0:0: [sdb]
[ 2627.577994] Sense Key : Medium Error [current]
[ 2627.578000] sd 2:0:0:0: [sdb]
[ 2627.578005] Add. Sense: Unrecovered read error
[ 2627.578009] sd 2:0:0:0: [sdb] CDB:
[ 2627.578011] Read(10): 28 00 00 00 00 41 00 00 06 00
[ 2627.578027] end_request: critical medium error, dev sdb, sector 65
[ 2627.578034] Buffer I/O error on device sdb1, logical block 2
[ 2627.578040] Buffer I/O error on device sdb1, logical block 3
[ 2627.578044] Buffer I/O error on device sdb1, logical block 4
[ 2627.578048] Buffer I/O error on device sdb1, logical block 5
[ 2627.578051] Buffer I/O error on device sdb1, logical block 6
[ 2627.578055] Buffer I/O error on device sdb1, logical block 7
[13229.555943] perf interrupt took too long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
[16854.055029] usb 1-3: USB disconnect, device number 2
[16855.022160] usb 1-3: new low-speed USB device number 6 using xhci_hcd
[16855.470854] usb 1-3: New USB device found, idVendor=0e8f, idProduct=00fb
[16855.470857] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[16855.470859] usb 1-3: Product: USB Mouse
[16855.470861] usb 1-3: Manufacturer: YSTEK
[16855.470957] usb 1-3: ep 0x81 - rounding interval to 64 microframes, ep desc says 80 microframes
[16855.473472] input: YSTEK USB Mouse as /devices/pci0000:00/0000:00:14.0/usb1/1-3/1-3:1.0/0003:0E8F:00FB.0002/input/input17
[16855.473590] hid-generic 0003:0E8F:00FB.0002: input,hidraw0: USB HID v1.10 Mouse [YSTEK USB Mouse] on usb-0000:00:14.0-3/input0