[14259.451957] usb 1-4: new high speed USB device number 3 using ehci_hcd
[14259.655844] Initializing USB Mass Storage driver...
[14259.656172] scsi8 : usb-storage 1-4:1.0
[14259.656741] usbcore: registered new interface driver usb-storage
[14259.656749] USB Mass Storage support registered.
[14259.676003] usbcore: registered new interface driver uas
[14260.657165] scsi 8:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14260.658381] sd 8:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14260.659997] sd 8:0:0:0: [sdb] Write Protect is off
[14260.660005] sd 8:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14260.662387] sd 8:0:0:0: [sdb] No Caching mode page present
[14260.662398] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[14260.664984] sd 8:0:0:0: [sdb] No Caching mode page present
[14260.664990] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[14260.725051]  sdb: sdb1
[14260.729012] sd 8:0:0:0: [sdb] No Caching mode page present
[14260.729023] sd 8:0:0:0: [sdb] Assuming drive cache: write through
[14260.729031] sd 8:0:0:0: [sdb] Attached SCSI disk
[14262.044179] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[14279.888761] usb 1-4: USB disconnect, device number 3
[14279.890545] Aborting journal on device sdb1-8.
[14279.890576] JBD2: I/O error detected when updating journal superblock for sdb1-8.
[14279.890629] journal commit I/O error
[14279.921261] Buffer I/O error on device sdb1, logical block 0
[14279.921271] lost page write due to I/O error on sdb1
[14279.921279] EXT4-fs error (device sdb1): ext4_put_super:801: Couldn't clean up the journal
[14279.921288] EXT4-fs (sdb1): Remounting filesystem read-only
[14279.921293] EXT4-fs (sdb1): previous I/O error to superblock detected
[14279.921300] Buffer I/O error on device sdb1, logical block 0
[14279.921305] lost page write due to I/O error on sdb1
[14280.121959] usb 1-4: new high speed USB device number 4 using ehci_hcd
[14280.248127] scsi9 : usb-storage 1-4:1.0
[14281.247168] scsi 9:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14281.249518] sd 9:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14281.251014] sd 9:0:0:0: [sdb] Write Protect is off
[14281.251024] sd 9:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14281.252427] sd 9:0:0:0: [sdb] No Caching mode page present
[14281.252435] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[14281.256006] sd 9:0:0:0: [sdb] No Caching mode page present
[14281.256015] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[14281.310529]  sdb: sdb1
[14281.314992] sd 9:0:0:0: [sdb] No Caching mode page present
[14281.315001] sd 9:0:0:0: [sdb] Assuming drive cache: write through
[14281.315008] sd 9:0:0:0: [sdb] Attached SCSI disk
[14282.094029] EXT4-fs (sdb1): recovery complete
[14282.094984] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[14294.917389] usb 1-4: USB disconnect, device number 4
[14294.951958] sd 9:0:0:0: [sdb] Unhandled error code
[14294.951968] sd 9:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[14294.951977] sd 9:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 0a 80 e4 40 00 00 f0 00
[14294.951995] end_request: I/O error, dev sdb, sector 176219200
[14294.952051] sd 9:0:0:0: [sdb] Unhandled error code
[14294.952056] sd 9:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[14294.952062] sd 9:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 0a 80 e5 30 00 00 f0 00
[14294.952079] end_request: I/O error, dev sdb, sector 176219440
[14294.952219] Aborting journal on device sdb1-8.
[14294.952242] JBD2: I/O error detected when updating journal superblock for sdb1-8.
[14294.952271] journal commit I/O error
[14294.972284] Buffer I/O error on device sdb1, logical block 0
[14294.972293] lost page write due to I/O error on sdb1
[14294.972302] EXT4-fs error (device sdb1): ext4_put_super:801: Couldn't clean up the journal
[14294.972311] EXT4-fs (sdb1): Remounting filesystem read-only
[14294.972316] EXT4-fs (sdb1): previous I/O error to superblock detected
[14294.972323] Buffer I/O error on device sdb1, logical block 0
[14294.972327] lost page write due to I/O error on sdb1
[14295.181980] usb 1-4: new high speed USB device number 5 using ehci_hcd
[14295.307915] scsi10 : usb-storage 1-4:1.0
[14296.357582] scsi 10:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14296.360884] sd 10:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14296.362285] sd 10:0:0:0: [sdb] Write Protect is off
[14296.362295] sd 10:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14296.362996] sd 10:0:0:0: [sdb] No Caching mode page present
[14296.363003] sd 10:0:0:0: [sdb] Assuming drive cache: write through
[14296.366260] sd 10:0:0:0: [sdb] No Caching mode page present
[14296.366272] sd 10:0:0:0: [sdb] Assuming drive cache: write through
[14296.369807]  sdb: sdb1
[14296.375008] sd 10:0:0:0: [sdb] No Caching mode page present
[14296.375026] sd 10:0:0:0: [sdb] Assuming drive cache: write through
[14296.375033] sd 10:0:0:0: [sdb] Attached SCSI disk
[14296.853768] usb 1-4: USB disconnect, device number 5
[14296.884075] scsi 10:0:0:0: [sdb] Unhandled error code
[14296.884083] scsi 10:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
[14296.884106] scsi 10:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 00 00 00 00 08 00
[14296.884125] end_request: I/O error, dev sdb, sector 0
[14296.884136] Buffer I/O error on device sdb, logical block 0
[14296.884241] Buffer I/O error on device sdb, logical block 0
[14296.884290] Buffer I/O error on device sdb, logical block 0
[14296.884301] Buffer I/O error on device sdb, logical block 0
[14296.884311] Buffer I/O error on device sdb, logical block 0
[14296.884327] Buffer I/O error on device sdb, logical block 0
[14296.884336] Buffer I/O error on device sdb, logical block 0
[14296.884361] Buffer I/O error on device sdb, logical block 3
[14297.108619] usb 1-4: new high speed USB device number 6 using ehci_hcd
[14297.234916] scsi11 : usb-storage 1-4:1.0
[14298.237172] scsi 11:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14298.240266] sd 11:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14298.241020] sd 11:0:0:0: [sdb] Write Protect is off
[14298.241028] sd 11:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14298.241996] sd 11:0:0:0: [sdb] No Caching mode page present
[14298.242004] sd 11:0:0:0: [sdb] Assuming drive cache: write through
[14298.244992] sd 11:0:0:0: [sdb] No Caching mode page present
[14298.245000] sd 11:0:0:0: [sdb] Assuming drive cache: write through
[14298.245633]  sdb: sdb1
[14298.248999] sd 11:0:0:0: [sdb] No Caching mode page present
[14298.249008] sd 11:0:0:0: [sdb] Assuming drive cache: write through
[14298.249015] sd 11:0:0:0: [sdb] Attached SCSI disk
[14298.425771] usb 1-4: USB disconnect, device number 6
[14298.427516] scsi 11:0:0:0: [sdb] killing request
[14298.427667] scsi 11:0:0:0: [sdb] Unhandled error code
[14298.427673] scsi 11:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[14298.427681] scsi 11:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 08 08 00 00 08 00
[14298.427700] end_request: I/O error, dev sdb, sector 2056
[14298.685281] usb 1-4: new high speed USB device number 7 using ehci_hcd
[14298.810910] scsi12 : usb-storage 1-4:1.0
[14299.811166] scsi 12:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14299.814385] sd 12:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14299.815016] sd 12:0:0:0: [sdb] Write Protect is off
[14299.815025] sd 12:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14299.816001] sd 12:0:0:0: [sdb] No Caching mode page present
[14299.816009] sd 12:0:0:0: [sdb] Assuming drive cache: write through
[14299.818999] sd 12:0:0:0: [sdb] No Caching mode page present
[14299.819007] sd 12:0:0:0: [sdb] Assuming drive cache: write through
[14299.819627]  sdb: sdb1
[14299.823031] sd 12:0:0:0: [sdb] No Caching mode page present
[14299.823042] sd 12:0:0:0: [sdb] Assuming drive cache: write through
[14299.823049] sd 12:0:0:0: [sdb] Attached SCSI disk
[14299.981655] usb 1-4: USB disconnect, device number 7
[14299.983609] scsi 12:0:0:0: [sdb] killing request
[14299.983769] scsi 12:0:0:0: [sdb] Unhandled error code
[14299.983774] scsi 12:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[14299.983783] scsi 12:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 08 18 00 00 08 00
[14299.983802] end_request: I/O error, dev sdb, sector 2072
[14299.983812] quiet_error: 139 callbacks suppressed
[14299.983818] Buffer I/O error on device sdb1, logical block 3
[14299.983937] Buffer I/O error on device sdb1, logical block 3
[14299.983974] Buffer I/O error on device sdb1, logical block 3
[14299.983985] Buffer I/O error on device sdb1, logical block 3
[14299.983996] Buffer I/O error on device sdb1, logical block 3
[14299.984022] Buffer I/O error on device sdb1, logical block 7
[14299.984033] Buffer I/O error on device sdb1, logical block 7
[14299.984043] Buffer I/O error on device sdb1, logical block 7
[14299.984053] Buffer I/O error on device sdb1, logical block 7
[14299.984067] Buffer I/O error on device sdb1, logical block 15
[14300.238622] usb 1-4: new high speed USB device number 8 using ehci_hcd
[14300.364923] scsi13 : usb-storage 1-4:1.0
[14301.367167] scsi 13:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14301.368380] sd 13:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14301.370294] sd 13:0:0:0: [sdb] Write Protect is off
[14301.370304] sd 13:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14301.371010] sd 13:0:0:0: [sdb] No Caching mode page present
[14301.371018] sd 13:0:0:0: [sdb] Assuming drive cache: write through
[14301.375002] sd 13:0:0:0: [sdb] No Caching mode page present
[14301.375012] sd 13:0:0:0: [sdb] Assuming drive cache: write through
[14301.375637]  sdb: sdb1
[14301.380007] sd 13:0:0:0: [sdb] No Caching mode page present
[14301.380020] sd 13:0:0:0: [sdb] Assuming drive cache: write through
[14301.380027] sd 13:0:0:0: [sdb] Attached SCSI disk
[14301.893657] usb 1-4: USB disconnect, device number 8
[14301.928623] sd 13:0:0:0: [sdb] Unhandled error code
[14301.928631] sd 13:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[14301.928639] sd 13:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 29 08 00 00 08 00
[14301.928657] end_request: I/O error, dev sdb, sector 10504
[14301.928791] EXT4-fs error (device sdb1): __ext4_get_inode_loc:3308: inode #8: block 1057: comm mount: unable to read itable block
[14301.928822] EXT4-fs (sdb1): no journal found
[14302.155278] usb 1-4: new high speed USB device number 9 using ehci_hcd
[14302.280948] scsi14 : usb-storage 1-4:1.0
[14303.336178] scsi 14:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14303.337500] sd 14:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14303.339051] sd 14:0:0:0: [sdb] Write Protect is off
[14303.339062] sd 14:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14303.340012] sd 14:0:0:0: [sdb] No Caching mode page present
[14303.340020] sd 14:0:0:0: [sdb] Assuming drive cache: write through
[14303.343010] sd 14:0:0:0: [sdb] No Caching mode page present
[14303.343020] sd 14:0:0:0: [sdb] Assuming drive cache: write through
[14303.349394]  sdb: sdb1
[14303.353022] sd 14:0:0:0: [sdb] No Caching mode page present
[14303.353035] sd 14:0:0:0: [sdb] Assuming drive cache: write through
[14303.353042] sd 14:0:0:0: [sdb] Attached SCSI disk
[14303.520143] usb 1-4: USB disconnect, device number 9
[14303.550078] scsi 14:0:0:0: [sdb] Unhandled error code
[14303.550093] scsi 14:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
[14303.550103] scsi 14:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 00 20 00 00 08 00
[14303.550127] end_request: I/O error, dev sdb, sector 32
[14303.775322] usb 1-4: new high speed USB device number 10 using ehci_hcd
[14303.900925] scsi15 : usb-storage 1-4:1.0
[14304.955179] scsi 15:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14304.957838] sd 15:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14304.959027] sd 15:0:0:0: [sdb] Write Protect is off
[14304.959038] sd 15:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14304.960010] sd 15:0:0:0: [sdb] No Caching mode page present
[14304.960018] sd 15:0:0:0: [sdb] Assuming drive cache: write through
[14304.963996] sd 15:0:0:0: [sdb] No Caching mode page present
[14304.964004] sd 15:0:0:0: [sdb] Assuming drive cache: write through
[14304.967523]  sdb: sdb1
[14304.971018] sd 15:0:0:0: [sdb] No Caching mode page present
[14304.971029] sd 15:0:0:0: [sdb] Assuming drive cache: write through
[14304.971036] sd 15:0:0:0: [sdb] Attached SCSI disk
[14305.068769] usb 1-4: USB disconnect, device number 10
[14305.100070] scsi 15:0:0:0: [sdb] Unhandled error code
[14305.100078] scsi 15:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
[14305.100092] scsi 15:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 08 00 00 00 08 00
[14305.100115] end_request: I/O error, dev sdb, sector 2048
[14305.100125] quiet_error: 47 callbacks suppressed
[14305.100131] Buffer I/O error on device sdb, logical block 256
[14305.100364] Buffer I/O error on device sdb, logical block 256
[14305.100499] Buffer I/O error on device sdb, logical block 0
[14305.100508] Buffer I/O error on device sdb, logical block 0
[14305.100520] Buffer I/O error on device sdb, logical block 0
[14305.100530] Buffer I/O error on device sdb, logical block 0
[14305.100540] Buffer I/O error on device sdb, logical block 0
[14305.100554] Buffer I/O error on device sdb, logical block 1
[14305.100565] Buffer I/O error on device sdb, logical block 1
[14305.100574] Buffer I/O error on device sdb, logical block 1
[14305.325280] usb 1-4: new high speed USB device number 11 using ehci_hcd
[14305.451039] scsi16 : usb-storage 1-4:1.0
[14306.507309] scsi 16:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14306.510004] sd 16:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14306.510992] sd 16:0:0:0: [sdb] Write Protect is off
[14306.511000] sd 16:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14306.512050] sd 16:0:0:0: [sdb] No Caching mode page present
[14306.512062] sd 16:0:0:0: [sdb] Assuming drive cache: write through
[14306.515001] sd 16:0:0:0: [sdb] No Caching mode page present
[14306.515011] sd 16:0:0:0: [sdb] Assuming drive cache: write through
[14306.519771]  sdb: sdb1
[14306.525033] sd 16:0:0:0: [sdb] No Caching mode page present
[14306.525043] sd 16:0:0:0: [sdb] Assuming drive cache: write through
[14306.525050] sd 16:0:0:0: [sdb] Attached SCSI disk
[14306.612273] usb 1-4: USB disconnect, device number 11
[14306.643068] scsi 16:0:0:0: [sdb] Unhandled error code
[14306.643077] scsi 16:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
[14306.643090] scsi 16:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 08 00 00 00 08 00
[14306.643109] end_request: I/O error, dev sdb, sector 2048
[14306.868632] usb 1-4: new high speed USB device number 12 using ehci_hcd
[14306.995096] scsi17 : usb-storage 1-4:1.0
[14308.048300] scsi 17:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[14308.050630] sd 17:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14308.052335] sd 17:0:0:0: [sdb] Write Protect is off
[14308.052346] sd 17:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14308.052998] sd 17:0:0:0: [sdb] No Caching mode page present
[14308.053006] sd 17:0:0:0: [sdb] Assuming drive cache: write through
[14308.056996] sd 17:0:0:0: [sdb] No Caching mode page present
[14308.057006] sd 17:0:0:0: [sdb] Assuming drive cache: write through
[14308.061013]  sdb: sdb1
[14308.066043] sd 17:0:0:0: [sdb] No Caching mode page present
[14308.066056] sd 17:0:0:0: [sdb] Assuming drive cache: write through
[14308.066063] sd 17:0:0:0: [sdb] Attached SCSI disk
[14308.232138] usb 1-4: USB disconnect, device number 12
[14308.262066] scsi 17:0:0:0: [sdb] Unhandled error code
[14308.262074] scsi 17:0:0:0: [sdb]  Result: hostbyte=0x07 driverbyte=0x00
[14308.262082] scsi 17:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 00 00 00 20 00 00 08 00
[14308.262110] end_request: I/O error, dev sdb, sector 32
[14308.488654] usb 1-4: new high speed USB device number 13 using ehci_hcd
[14308.635517] hub 1-0:1.0: unable to enumerate USB device on port 4
[14309.055293] usb 3-4: new full speed USB device number 3 using ohci_hcd
[14309.236166] usb 3-4: not running at top speed; connect to a high speed hub
[14309.257500] scsi18 : usb-storage 3-4:1.0
[14310.320219] scsi scan: INQUIRY result too short (5), using 36
[14310.320236] scsi 18:0:0:0: Direct-Access                                    PQ: 0 ANSI: 0
[14310.331220] sd 18:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[14310.338189] sd 18:0:0:0: [sdb] Write Protect is off
[14310.338204] sd 18:0:0:0: [sdb] Mode Sense: 23 00 00 00
[14310.345196] sd 18:0:0:0: [sdb] No Caching mode page present
[14310.345206] sd 18:0:0:0: [sdb] Assuming drive cache: write through
[14310.370207] sd 18:0:0:0: [sdb] No Caching mode page present
[14310.370218] sd 18:0:0:0: [sdb] Assuming drive cache: write through
[14310.380218]  sdb: sdb1
[14310.430213] sd 18:0:0:0: [sdb] No Caching mode page present
[14310.430225] sd 18:0:0:0: [sdb] Assuming drive cache: write through
[14310.430233] sd 18:0:0:0: [sdb] Attached SCSI disk
[14313.240265] EXT4-fs (sdb1): recovery complete
[14313.249169] EXT4-fs (sdb1): mounted filesystem with ordered data mode. Opts: (null)
[14907.760056] usb 3-4: USB disconnect, device number 3
[15776.111827] usb 1-4: new high speed USB device number 14 using ehci_hcd
[15776.238129] scsi19 : usb-storage 1-4:1.0
[15777.237150] scsi 19:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[15777.238246] sd 19:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[15777.241151] sd 19:0:0:0: [sdb] Write Protect is off
[15777.241163] sd 19:0:0:0: [sdb] Mode Sense: 23 00 00 00
[15777.241974] sd 19:0:0:0: [sdb] No Caching mode page present
[15777.241983] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[15777.244974] sd 19:0:0:0: [sdb] No Caching mode page present
[15777.244984] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[15777.312770]  sdb: sdb1
[15777.316975] sd 19:0:0:0: [sdb] No Caching mode page present
[15777.316985] sd 19:0:0:0: [sdb] Assuming drive cache: write through
[15777.316992] sd 19:0:0:0: [sdb] Attached SCSI disk
[15796.626487] show_signal_msg: 121 callbacks suppressed
[15796.626498] pcmanfm[4915]: segfault at 18 ip 00007f13661c0bb3 sp 00007fff7e3310a0 error 4 in libfm-gtk.so.1.0.0[7f136619e000+43000]
[15850.861015] usb 1-4: USB disconnect, device number 14
[15850.895169] sd 19:0:0:0: [sdb] Unhandled error code
[15850.895180] sd 19:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[15850.895189] sd 19:0:0:0: [sdb] CDB: cdb[0]=0x28: 28 00 1d 1c 33 f8 00 00 08 00
[15850.895207] end_request: I/O error, dev sdb, sector 488387576
[15851.178453] usb 1-4: new high speed USB device number 15 using ehci_hcd
[15851.303260] scsi20 : usb-storage 1-4:1.0
[15852.355909] scsi 20:0:0:0: Direct-Access     BUFFALO  HD-PETU2         1.04 PQ: 0 ANSI: 4
[15852.357719] sd 20:0:0:0: [sdb] 976773168 512-byte logical blocks: (500 GB/465 GiB)
[15852.359057] sd 20:0:0:0: [sdb] Write Protect is off
[15852.359080] sd 20:0:0:0: [sdb] Mode Sense: 23 00 00 00
[15852.360015] sd 20:0:0:0: [sdb] No Caching mode page present
[15852.360026] sd 20:0:0:0: [sdb] Assuming drive cache: write through
[15852.362986] sd 20:0:0:0: [sdb] No Caching mode page present
[15852.362996] sd 20:0:0:0: [sdb] Assuming drive cache: write through
[15852.368373]  sdb: sdb1
[15852.372003] sd 20:0:0:0: [sdb] No Caching mode page present
[15852.372014] sd 20:0:0:0: [sdb] Assuming drive cache: write through
[15852.372021] sd 20:0:0:0: [sdb] Attached SCSI disk
[15936.008374] usb 1-4: USB disconnect, device number 15
[15936.041787] sd 20:0:0:0: [sdb] Unhandled error code
[15936.041793] sd 20:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[15936.041796] sd 20:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 07 85 ea c0 00 00 f0 00
[15936.041805] end_request: I/O error, dev sdb, sector 126216896
[15936.041810] Buffer I/O error on device sdb1, logical block 15776856
[15936.041812] lost page write due to I/O error on sdb1
[15936.041819] Buffer I/O error on device sdb1, logical block 15776857
[15936.041821] lost page write due to I/O error on sdb1
[15936.041824] Buffer I/O error on device sdb1, logical block 15776858
[15936.041826] lost page write due to I/O error on sdb1
[15936.041830] Buffer I/O error on device sdb1, logical block 15776859
[15936.041832] lost page write due to I/O error on sdb1
[15936.041835] Buffer I/O error on device sdb1, logical block 15776860
[15936.041837] lost page write due to I/O error on sdb1
[15936.041840] Buffer I/O error on device sdb1, logical block 15776861
[15936.041842] lost page write due to I/O error on sdb1
[15936.041845] Buffer I/O error on device sdb1, logical block 15776862
[15936.041847] lost page write due to I/O error on sdb1
[15936.041850] Buffer I/O error on device sdb1, logical block 15776863
[15936.041852] lost page write due to I/O error on sdb1
[15936.041855] Buffer I/O error on device sdb1, logical block 15776864
[15936.041857] lost page write due to I/O error on sdb1
[15936.046269] sd 20:0:0:0: [sdb] Unhandled error code
[15936.046269] sd 20:0:0:0: [sdb]  Result: hostbyte=0x01 driverbyte=0x00
[15936.046269] sd 20:0:0:0: [sdb] CDB: cdb[0]=0x2a: 2a 00 07 85 eb b0 00 00 f0 00
[15936.046269] end_request: I/O error, dev sdb, sector 126217136
[15936.378459] usb 1-4: new high speed USB device number 16 using ehci_hcd
[15936.525394] hub 1-0:1.0: unable to enumerate USB device on port 4
[15936.945135] usb 3-4: new full speed USB device number 4 using ohci_hcd
[15937.126318] usb 3-4: not running at top speed; connect to a high speed hub
[15937.154035] scsi21 : usb-storage 3-4:1.0
[15938.216404] scsi 21:0:0:0: Scanner              k Rrj 3  C rl yK F          PQ: 1 ANSI: 2