mike@MikeNetbook:~$ dmesg | tail
[29517.074574] sd 1:0:1:0: [sdb] CDB:
[29517.074577] Read(10): 28 00 12 61 a0 00 00 00 08 00
[30099.669703] sd 1:0:1:0: [sdb] Unhandled error code
[30099.669711] sd 1:0:1:0: [sdb]
[30099.669716] Result: hostbyte=DID_BAD_TARGET driverbyte=DRIVER_OK
[30099.669720] sd 1:0:1:0: [sdb] CDB:
[30099.669723] Read(10): 28 00 00 00 08 02 00 00 02 00
[30099.669737] blk_update_request: 363 callbacks suppressed
[30099.669741] end_request: I/O error, dev sdb, sector 2050
[30099.669770] EXT4-fs (sdb1): unable to read superblock