Dec 25 18:15:30 localhost kernel: sda : READ CAPACITY failed.
Dec 25 18:15:30 localhost kernel: sda : status=1, message=00, host=0, driver=08
Dec 25 18:15:30 localhost kernel: sd: Current: sense key: Unit Attention
Dec 25 18:15:30 localhost kernel:     Additional sense: Medium format corrupted
Dec 25 18:15:30 localhost kernel: sda: test WP failed, assume Write Enabled
Dec 25 18:15:30 localhost kernel: sda: assuming drive cache: write through
Dec 25 18:15:30 localhost kernel:  sda:end_request: I/O error, dev sda, sector 0
Dec 25 18:15:30 localhost kernel: printk: 3 messages suppressed.
Dec 25 18:15:30 localhost kernel: Buffer I/O error on device sda, logical block 0
Dec 25 18:15:30 localhost kernel:  unable to read partition table