> Tenho um HD externo de 500GB formatado com ntfs, que eu uso pra fazer
> backups tanto no windows quanto no linux.
>
> O problema é que o hd não está montando corretamente. Eu preciso ligar e
> desligar ele algumas vezes para que ele seja detectado. E quando isso
> acontece, ainda há o risco de dar um i/o error nele e ele ser desconectado
> no meio de uma operação de cópia, por exemplo...
>
> Segue o dmesg:
>
> [13280.193787] usb-storage: device found at 23
> [13280.193794] usb-storage: waiting for device to settle before scanning
> [13280.194226] usb 1-1: New USB device found, idVendor=152d, idProduct=2339
> [13280.194234] usb 1-1: New USB device strings: Mfr=1, Product=2,
> SerialNumber=5
> [13280.194239] usb 1-1: Product: USB to ATA/ATAPI Bridge
> [13280.194242] usb 1-1: Manufacturer: JMicron
> [13280.194245] usb 1-1: SerialNumber: 152D203380B6
> [13285.927533] usb-storage: device scan complete
> [13286.020900] scsi 11:0:0:0: Direct-Access SAMSUNG
> HM500JI P
> Q: 0 ANSI: 2 CCS
> [13286.021073] sd 11:0:0:0: [sdg] 976773168 512-byte hardware sectors
> (500108 MB
> )
> [13286.021681] sd 11:0:0:0: [sdg] Write Protect is off
> [13286.021688] sd 11:0:0:0: [sdg] Mode Sense: 00 38 00 00
> [13286.021691] sd 11:0:0:0: [sdg] Assuming drive cache: write through
> [13286.024901] sd 11:0:0:0: [sdg] 976773168 512-byte hardware sectors
> (500108 MB
> )
> [13286.024901] sd 11:0:0:0: [sdg] Write Protect is off
> [13286.024901] sd 11:0:0:0: [sdg] Mode Sense: 00 38 00 00
> [13286.024901] sd 11:0:0:0: [sdg] Assuming drive cache: write through
> [13286.024901] sdg: sdg1
> [13286.045407] sd 11:0:0:0: [sdg] Attached SCSI disk
> [13286.045407] sd 11:0:0:0: Attached scsi generic sg7 type 0
> [13396.033646] usb 1-1: reset high speed USB device using ehci_hcd and
> address 23
> [13396.174835] usb 1-1: device firmware changed
> [13396.174835] usb 1-1: USB disconnect, address 23
> [13396.174835] sd 11:0:0:0: Device offlined - not ready after error recovery
> [13396.174835] sd 11:0:0:0: [sdg] Result: hostbyte=DID_ABORT
> driverbyte=DRIVER_OK,SUGGEST_OK
> [13396.174835] end_request: I/O error, dev sdg, sector 13242711
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655331
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655332
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655333
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655334
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655335
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655336
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655337
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655338
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655339
> [13396.174835] Buffer I/O error on device sdg1, logical block 1655340
> [13396.174835] sd 11:0:0:0: rejecting I/O to offline device
> [13396.174835] sd 11:0:0:0: rejecting I/O to offline device
> [13396.174835] sd 11:0:0:0: [sdg] Result: hostbyte=DID_NO_CONNECT
> driverbyte=DRIVER_OK,SUGGEST_OK
> [13396.174835] end_request: I/O error, dev sdg, sector 13242951
> [13396.174835] sd 11:0:0:0: rejecting I/O to offline device
> [13396.174835] sd 11:0:0:0: rejecting I/O to offline device
> [13396.174835] sd 11:0:0:0: rejecting I/O to offline device
> [13396.174835] sd 11:0:0:0: rejecting I/O to offline device
> [13396.318119] usb 1-1: new high speed USB device using ehci_hcd and address
> 24
> [13396.451843] usb 1-1: configuration #1 chosen from 1 choice
> [13396.451843] scsi12 : SCSI emulation for USB Mass Storage devices
> [13396.451843] usb-storage: device found at 24
> [13396.451843] usb-storage: waiting for device to settle before scanning
> [13396.451843] usb 1-1: New USB device found, idVendor=152d, idProduct=2339
> [13396.451843] usb 1-1: New USB device strings: Mfr=1, Product=2,
> SerialNumber=5
> [13396.451843] usb 1-1: Product: USB to ATA/ATAPI Bridge
> [13396.451843] usb 1-1: Manufacturer: JMicron
> [13396.451843] usb 1-1: SerialNumber: 1F10404818FF
> [13401.696565] usb-storage: device scan complete
> [13408.746659] usb 1-1: reset high speed USB device using ehci_hcd and
> address 24
> [13421.246677] usb 1-1: reset high speed USB device using ehci_hcd and
> address 24
> [13422.099145] usb 1-1: USB disconnect, address 24
> [13422.100862] scsi 12:0:0:0: Device offlined - not ready after error
> recovery
>