more dmesg

[2817009.102181] sr1: scsi3-mmc drive: 0x/0x caddy
[2817009.102332] sr 95:0:0:1: Attached scsi CD-ROM sr1
[2817009.102415] sr 95:0:0:1: Attached scsi generic sg3 type 5
[2817009.103031] sd 95:0:0:0: [sdb] 15564800 512-byte logical blocks: (7.96 GB/7.42 GiB)
[2817009.103519] sd 95:0:0:0: [sdb] Write Protect is off
[2817009.103523] sd 95:0:0:0: [sdb] Mode Sense: 03 00 00 00
[2817009.103527] sd 95:0:0:0: [sdb] Assuming drive cache: write through
[2817009.106847] sd 95:0:0:0: [sdb] Assuming drive cache: write through
[2817009.106855]  sdb: sdb1
[2817009.114260] sd 95:0:0:0: [sdb] Assuming drive cache: write through
[2817009.114267] sd 95:0:0:0: [sdb] Attached SCSI removable disk
[2817009.594863] FAT: utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
[2839141.548677] usb 2-2: USB disconnect, address 116
[2839318.140022] usb 2-1: new high speed USB device using ehci_hcd and address 117
[2839318.274195] usb 2-1: New USB device found, idVendor=1058, idProduct=1021
[2839318.274200] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2839318.274205] usb 2-1: Product: Ext HDD 1021
[2839318.274208] usb 2-1: Manufacturer: Western Digital
[2839318.274210] usb 2-1: SerialNumber: 574D41565532343032313037
[2839318.274352] usb 2-1: configuration #1 chosen from 1 choice
[2839318.274930] scsi96 : SCSI emulation for USB Mass Storage devices
[2839318.275113] usb-storage: device found at 117
[2839318.275117] usb-storage: waiting for device to settle before scanning
[2839323.272250] usb-storage: device scan complete
[2839323.273097] scsi 96:0:0:0: Direct-Access     WD       Ext HDD 1021     2002 PQ: 0 ANSI: 4
[2839323.274512] sd 96:0:0:0: Attached scsi generic sg2 type 0
[2839323.277077] sd 96:0:0:0: [sdb] 2930272256 512-byte logical blocks: (1.50 TB/1.36 TiB)
[2839323.277952] sd 96:0:0:0: [sdb] Test WP failed, assume Write Enabled
[2839323.277956] sd 96:0:0:0: [sdb] Assuming drive cache: write through
[2839323.279450] sd 96:0:0:0: [sdb] Test WP failed, assume Write Enabled
[2839323.279453] sd 96:0:0:0: [sdb] Assuming drive cache: write through
[2839323.279458]  sdb: sdb1
[2839323.290333] sd 96:0:0:0: [sdb] Test WP failed, assume Write Enabled
[2839323.290339] sd 96:0:0:0: [sdb] Assuming drive cache: write through
[2839323.290345] sd 96:0:0:0: [sdb] Attached SCSI disk
[2839372.395517] usb 2-1: USB disconnect, address 117
[2839372.403514] sd 96:0:0:0: [sdb] Unhandled error code
[2839372.403520] sd 96:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[2839372.403526] sd 96:0:0:0: [sdb] CDB: Write(10): 2a 00 18 73 b8 70 00 00 f0 00
[2839372.403537] end_request: I/O error, dev sdb, sector 410237040
[2839372.403543] Buffer I/O error on device sdb1, logical block 51279374
[2839372.403547] lost page write due to I/O error on sdb1
[2839372.403554] Buffer I/O error on device sdb1, logical block 51279375
[2839372.403557] lost page write due to I/O error on sdb1
[2839372.403562] Buffer I/O error on device sdb1, logical block 51279376
[2839372.403565] lost page write due to I/O error on sdb1
[2839372.403569] Buffer I/O error on device sdb1, logical block 51279377
[2839372.403572] lost page write due to I/O error on sdb1
[2839372.403576] Buffer I/O error on device sdb1, logical block 51279378
[2839372.403579] lost page write due to I/O error on sdb1
[2839372.403583] Buffer I/O error on device sdb1, logical block 51279379
[2839372.403586] lost page write due to I/O error on sdb1
[2839372.403590] Buffer I/O error on device sdb1, logical block 51279380
[2839372.403593] lost page write due to I/O error on sdb1
[2839372.403601] Buffer I/O error on device sdb1, logical block 51279381
[2839372.403604] lost page write due to I/O error on sdb1
[2839372.403608] Buffer I/O error on device sdb1, logical block 51279382
[2839372.403611] lost page write due to I/O error on sdb1
[2839372.403615] Buffer I/O error on device sdb1, logical block 51279383
[2839372.403618] lost page write due to I/O error on sdb1
[2839372.408669] sd 96:0:0:0: [sdb] Unhandled error code
[2839372.408675] sd 96:0:0:0: [sdb] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
[2839372.408683] sd 96:0:0:0: [sdb] CDB: Write(10): 2a 00 18 73 b9 60 00 00 f0 00
[2839372.408714] end_request: I/O error, dev sdb, sector 410237280
[2839373.044532] usb 2-1: new high speed USB device using ehci_hcd and address 118
[2839373.181385] usb 2-1: New USB device found, idVendor=1058, idProduct=1021
[2839373.181391] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2839373.181395] usb 2-1: Product: Ext HDD 1021
[2839373.181398] usb 2-1: Manufacturer: Western Digital
[2839373.181401] usb 2-1: SerialNumber: 574D41565532343032313037
[2839373.181534] usb 2-1: configuration #1 chosen from 1 choice
[2839373.181836] scsi97 : SCSI emulation for USB Mass Storage devices
[2839373.182037] usb-storage: device found at 118
[2839373.182040] usb-storage: waiting for device to settle before scanning
[2839378.180189] usb-storage: device scan complete
[2839378.181036] scsi 97:0:0:0: Direct-Access     WD       Ext HDD 1021     2002 PQ: 0 ANSI: 4
[2839378.181679] sd 97:0:0:0: Attached scsi generic sg2 type 0
[2839378.182766] sd 97:0:0:0: [sdc] 2930272256 512-byte logical blocks: (1.50 TB/1.36 TiB)
[2839378.183634] sd 97:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839378.183638] sd 97:0:0:0: [sdc] Assuming drive cache: write through
[2839378.187723] sd 97:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839378.187730] sd 97:0:0:0: [sdc] Assuming drive cache: write through
[2839378.187736]  sdc: sdc1
[2839378.200905] sd 97:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839378.200910] sd 97:0:0:0: [sdc] Assuming drive cache: write through
[2839378.200915] sd 97:0:0:0: [sdc] Attached SCSI disk
[2839378.302435] __ratelimit: 284 callbacks suppressed
[2839378.302441] Buffer I/O error on device sdb1, logical block 842208
[2839378.302447] lost page write due to I/O error on sdb1
[2839378.302452] Buffer I/O error on device sdb1, logical block 842209
[2839378.302455] lost page write due to I/O error on sdb1
[2839378.302460] Buffer I/O error on device sdb1, logical block 842210
[2839378.302463] lost page write due to I/O error on sdb1
[2839378.302469] Buffer I/O error on device sdb1, logical block 842211
[2839378.302472] lost page write due to I/O error on sdb1
[2839378.302481] Buffer I/O error on device sdb1, logical block 55276393
[2839378.302484] lost page write due to I/O error on sdb1
[2839378.302491] Buffer I/O error on device sdb1, logical block 73858163
[2839378.302494] lost page write due to I/O error on sdb1
[2839378.302505] Buffer I/O error on device sdb1, logical block 73858164
[2839378.302507] lost page write due to I/O error on sdb1
[2839378.302512] Buffer I/O error on device sdb1, logical block 73858165
[2839378.302515] lost page write due to I/O error on sdb1
[2839378.302520] Buffer I/O error on device sdb1, logical block 73858166
[2839378.302523] lost page write due to I/O error on sdb1
[2839378.302528] Buffer I/O error on device sdb1, logical block 73858167
[2839378.302531] lost page write due to I/O error on sdb1
[2839383.499152] __ratelimit: 195 callbacks suppressed
[2839383.499158] Buffer I/O error on device sdb1, logical block 46592381
[2839383.499465] Buffer I/O error on device sdb1, logical block 46592381
[2839383.500221] Buffer I/O error on device sdb1, logical block 46592381
[2839383.500386] Buffer I/O error on device sdb1, logical block 46592381
[2839383.567382] Buffer I/O error on device sdb1, logical block 46592381
[2839383.567636] Buffer I/O error on device sdb1, logical block 46592381
[2839383.668988] Buffer I/O error on device sdb1, logical block 46592381
[2839383.669140] Buffer I/O error on device sdb1, logical block 46592381
[2839383.782951] Buffer I/O error on device sdb1, logical block 46592381
[2839383.783177] Buffer I/O error on device sdb1, logical block 46592381
[2839396.092639] __ratelimit: 68 callbacks suppressed
[2839396.092643] Buffer I/O error on device sdb1, logical block 46592381
[2839396.092777] Buffer I/O error on device sdb1, logical block 46592381
[2839396.092962] Buffer I/O error on device sdb1, logical block 46592381
[2839396.093144] Buffer I/O error on device sdb1, logical block 46592381
[2839396.093365] Buffer I/O error on device sdb1, logical block 46592381
[2839396.093474] Buffer I/O error on device sdb1, logical block 46592381
[2839396.093728] Buffer I/O error on device sdb1, logical block 46592381
[2839396.093843] Buffer I/O error on device sdb1, logical block 46592381
[2839396.094051] Buffer I/O error on device sdb1, logical block 46592381
[2839396.094169] Buffer I/O error on device sdb1, logical block 46592381
[2839436.309955] usb 2-1: USB disconnect, address 118
[2839449.380024] usb 2-1: new high speed USB device using ehci_hcd and address 119
[2839449.514251] usb 2-1: New USB device found, idVendor=1058, idProduct=1021
[2839449.514256] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2839449.514260] usb 2-1: Product: Ext HDD 1021
[2839449.514263] usb 2-1: Manufacturer: Western Digital
[2839449.514266] usb 2-1: SerialNumber: 574D41565532343032313037
[2839449.514401] usb 2-1: configuration #1 chosen from 1 choice
[2839449.516062] scsi98 : SCSI emulation for USB Mass Storage devices
[2839449.516221] usb-storage: device found at 119
[2839449.516224] usb-storage: waiting for device to settle before scanning
[2839454.516681] usb-storage: device scan complete
[2839454.517527] scsi 98:0:0:0: Direct-Access     WD       Ext HDD 1021     2002 PQ: 0 ANSI: 4
[2839454.518187] sd 98:0:0:0: Attached scsi generic sg2 type 0
[2839454.519257] sd 98:0:0:0: [sdc] 2930272256 512-byte logical blocks: (1.50 TB/1.36 TiB)
[2839454.520174] sd 98:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839454.520178] sd 98:0:0:0: [sdc] Assuming drive cache: write through
[2839454.523640] sd 98:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839454.523645] sd 98:0:0:0: [sdc] Assuming drive cache: write through
[2839454.523652]  sdc: sdc1
[2839454.536259] sd 98:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839454.536264] sd 98:0:0:0: [sdc] Assuming drive cache: write through
[2839454.536270] sd 98:0:0:0: [sdc] Attached SCSI disk
[2839458.166202] usb 2-1: USB disconnect, address 119
[2839458.416025] usb 2-1: new high speed USB device using ehci_hcd and address 120
[2839458.550234] usb 2-1: New USB device found, idVendor=1058, idProduct=1021
[2839458.550240] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2839458.550244] usb 2-1: Product: Ext HDD 1021
[2839458.550247] usb 2-1: Manufacturer: Western Digital
[2839458.550250] usb 2-1: SerialNumber: 574D41565532343032313037
[2839458.550383] usb 2-1: configuration #1 chosen from 1 choice
[2839458.550683] scsi99 : SCSI emulation for USB Mass Storage devices
[2839458.550882] usb-storage: device found at 120
[2839458.550885] usb-storage: waiting for device to settle before scanning
[2839463.548167] usb-storage: device scan complete
[2839463.549014] scsi 99:0:0:0: Direct-Access     WD       Ext HDD 1021     2002 PQ: 0 ANSI: 4
[2839463.549663] sd 99:0:0:0: Attached scsi generic sg2 type 0
[2839463.550745] sd 99:0:0:0: [sdc] 2930272256 512-byte logical blocks: (1.50 TB/1.36 TiB)
[2839463.551610] sd 99:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839463.551614] sd 99:0:0:0: [sdc] Assuming drive cache: write through
[2839463.556620] sd 99:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839463.556626] sd 99:0:0:0: [sdc] Assuming drive cache: write through
[2839463.556633]  sdc: sdc1
[2839463.560623] sd 99:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839463.560629] sd 99:0:0:0: [sdc] Assuming drive cache: write through
[2839463.560634] sd 99:0:0:0: [sdc] Attached SCSI disk
[2839522.711549] usb 2-1: USB disconnect, address 120
[2839522.964027] usb 2-1: new high speed USB device using ehci_hcd and address 121
[2839523.098207] usb 2-1: New USB device found, idVendor=1058, idProduct=1021
[2839523.098213] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2839523.098217] usb 2-1: Product: Ext HDD 1021
[2839523.098220] usb 2-1: Manufacturer: Western Digital
[2839523.098222] usb 2-1: SerialNumber: 574D41565532343032313037
[2839523.098358] usb 2-1: configuration #1 chosen from 1 choice
[2839523.098649] scsi100 : SCSI emulation for USB Mass Storage devices
[2839523.098854] usb-storage: device found at 121
[2839523.098857] usb-storage: waiting for device to settle before scanning
[2839528.096141] usb-storage: device scan complete
[2839528.096986] scsi 100:0:0:0: Direct-Access     WD       Ext HDD 1021     2002 PQ: 0 ANSI: 4
[2839528.097676] sd 100:0:0:0: Attached scsi generic sg2 type 0
[2839528.098714] sd 100:0:0:0: [sdc] 2930272256 512-byte logical blocks: (1.50 TB/1.36 TiB)
[2839528.099582] sd 100:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839528.099586] sd 100:0:0:0: [sdc] Assuming drive cache: write through
[2839528.104021] sd 100:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839528.104027] sd 100:0:0:0: [sdc] Assuming drive cache: write through
[2839528.104034]  sdc: sdc1
[2839528.108468] sd 100:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2839528.108474] sd 100:0:0:0: [sdc] Assuming drive cache: write through
[2839528.108479] sd 100:0:0:0: [sdc] Attached SCSI disk
[2840138.949923] usb 2-1: USB disconnect, address 121
[2840152.331526] usb 2-1: new high speed USB device using ehci_hcd and address 122
[2840152.461746] usb 2-1: New USB device found, idVendor=1058, idProduct=1021
[2840152.461752] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[2840152.461757] usb 2-1: Product: Ext HDD 1021
[2840152.461760] usb 2-1: Manufacturer: Western Digital
[2840152.461762] usb 2-1: SerialNumber: 574D41565532343032313037
[2840152.461897] usb 2-1: configuration #1 chosen from 1 choice
[2840152.462280] scsi101 : SCSI emulation for USB Mass Storage devices
[2840152.462486] usb-storage: device found at 122
[2840152.462489] usb-storage: waiting for device to settle before scanning
[2840157.460177] usb-storage: device scan complete
[2840157.461024] scsi 101:0:0:0: Direct-Access     WD       Ext HDD 1021     2002 PQ: 0 ANSI: 4
[2840157.461666] sd 101:0:0:0: Attached scsi generic sg2 type 0
[2840157.462751] sd 101:0:0:0: [sdc] 2930272256 512-byte logical blocks: (1.50 TB/1.36 TiB)
[2840157.463620] sd 101:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2840157.463624] sd 101:0:0:0: [sdc] Assuming drive cache: write through
[2840157.466540] sd 101:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2840157.466546] sd 101:0:0:0: [sdc] Assuming drive cache: write through
[2840157.466552]  sdc: sdc1
[2840157.477504] sd 101:0:0:0: [sdc] Test WP failed, assume Write Enabled
[2840157.477509] sd 101:0:0:0: [sdc] Assuming drive cache: write through
[2840157.477516] sd 101:0:0:0: [sdc] Attached SCSI disk