dmesg not connected

flyingfisch@flyingfisch-Office-Computer:~$ dmesg|tail
[11468.138048] end_request: I/O error, dev sdc, sector 21376
[11473.379083] sd 42:0:0:0: [sdc] Unhandled error code
[11473.379093] sd 42:0:0:0: [sdc]  Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[11473.379099] sd 42:0:0:0: [sdc] CDB: Read(10): 28 00 00 00 60 c8 00 00 20 00
[11473.379112] end_request: I/O error, dev sdc, sector 24776
[11475.551120] sd 42:0:0:0: [sdc] Unhandled error code
[11475.551132] sd 42:0:0:0: [sdc]  Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK
[11475.551138] sd 42:0:0:0: [sdc] CDB: Write(10): 2a 00 00 00 3b 98 00 00 10 00
[11475.551151] end_request: I/O error, dev sdc, sector 15256
[11477.515723] usb 1-6: USB disconnect, device number 45