Hi, I am getting following error while connecting my pendrive, [ 3793.220454] scsi 5:0:0:0: Direct-Access Kingston DataTraveler 2.0 1.00 PQ: 0 ANSI: 4 [ 3793.220543] device: 'target5:0:0': device_add [ 3793.220562] bus: 'scsi': add device target5:0:0 [ 3793.220590] PM: Adding info for scsi:target5:0:0 [ 3793.220641] device: '5:0:0:0': device_add [ 3793.220676] bus: 'scsi': add device 5:0:0:0 [ 3793.220690] PM: Adding info for scsi:5:0:0:0 [ 3793.220703] bus: 'scsi': driver_probe_device: matched device 5:0:0:0 with driver sd [ 3793.220706] bus: 'scsi': really_probe: probing driver sd with device 5:0:0:0 [ 3793.220711] sd 5:0:0:0: no default pinctrl state [ 3793.220723] device: '5:0:0:0': device_add [ 3793.220754] PM: Adding info for No Bus:5:0:0:0 [ 3793.220771] driver: 'sd': driver_bound: bound to device '5:0:0:0' [ 3793.220774] bus: 'scsi': really_probe: bound device 5:0:0:0 to driver sd [ 3793.220778] device: '5:0:0:0': device_add [ 3793.220796] PM: Adding info for No Bus:5:0:0:0 [ 3793.220812] device: 'sg4': device_add [ 3793.220834] PM: Adding info for No Bus:sg4 [ 3793.220896] sd 5:0:0:0: Attached scsi generic sg4 type 0 [ 3793.220918] device: '5:0:0:0': device_add [ 3793.220943] PM: Adding info for No Bus:5:0:0:0 [ 3793.221427] sd 5:0:0:0: [sdc] 30233588 512-byte logical blocks: (15.4 GB/14.4 GiB) [ 3793.222072] sd 5:0:0:0: [sdc] Write Protect is off [ 3793.222079] sd 5:0:0:0: [sdc] Mode Sense: 45 00 00 00 [ 3793.222706] sd 5:0:0:0: [sdc] Write cache: disabled, read cache: enabled, doesn't support DPO or FUA [ 3793.222724] device: '8:32': device_add [ 3793.222768] PM: Adding info for No Bus:8:32 [ 3793.222816] device: 'sdc': device_add [ 3793.222853] PM: Adding info for No Bus:sdc [ 3793.238835] sd 5:0:0:0: [sdc] Attached SCSI removable disk [ 3922.968041] usb 1-3: reset high-speed USB device number 5 using ehci-pci [ 3923.100302] usb 1-3: device firmware changed [ 3923.100376] usb 1-3: USB disconnect, device number 5 [ 3923.100382] device: 'ep_81': device_unregister [ 3923.100412] PM: Removing info for No Bus:ep_81 [ 3923.100421] device: 'ep_02': device_unregister [ 3923.100439] PM: Removing info for No Bus:ep_02 [ 3923.100464] bus: 'usb': remove device 1-3:1.0 [ 3923.100477] device: '5:0:0:0': device_unregister [ 3923.100553] PM: Removing info for No Bus:5:0:0:0 [ 3923.100595] device: '5:0:0:0': device_create_release [ 3923.100598] device: '5:0:0:0': device_unregister [ 3923.100621] device: 'sg4': device_unregister [ 3923.104519] PM: Removing info for No Bus:sg4 [ 3923.104569] device: 'sg4': device_create_release [ 3923.104588] PM: Removing info for No Bus:5:0:0:0 [ 3923.104648] bus: 'scsi': remove device 5:0:0:0 [ 3923.104682] PM: Removing info for No Bus:5:0:0:0 [ 3923.108086] sd 5:0:0:0: [sdc] FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 3923.108094] sd 5:0:0:0: [sdc] CDB: Write(10) 2a 00 00 00 00 10 00 00 f0 00 [ 3923.108098] blk_update_request: I/O error, dev sdc, sector 16 [ 3923.108103] Buffer I/O error on dev sdc, logical block 4, lost async page write [ 3923.108107] Buffer I/O error on dev sdc, logical block 5, lost async page write [ 3923.108115] Buffer I/O error on dev sdc, logical block 6, lost async page write [ 3923.108117] Buffer I/O error on dev sdc, logical block 7, lost async page write [ 3923.108120] Buffer I/O error on dev sdc, logical block 8, lost async page write [ 3923.108122] Buffer I/O error on dev sdc, logical block 9, lost async page write [ 3923.108125] Buffer I/O error on dev sdc, logical block 10, lost async page write [ 3923.108128] Buffer I/O error on dev sdc, logical block 11, lost async page write [ 3923.108131] Buffer I/O error on dev sdc, logical block 12, lost async page write [ 3923.108133] Buffer I/O error on dev sdc, logical block 13, lost async page write [ 3923.113422] sd 5:0:0:0: [sdc] FAILED Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK [ 3923.113434] sd 5:0:0:0: [sdc] CDB: Write(10) 2a 00 00 00 01 00 00 00 f0 00 [ 3923.113437] blk_update_request: I/O error, dev sdc, sector 256 I am unable to mount it.What could be the issue? Can I recover it? I am using Ubuntu 14.04 (64-bits) with Kernel version 4.2.2. -- -- Regards, Anil Nair -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html