.........................................................................................not responding...
sda : READ CAPACITY failed.
sda : status=1, message=00, host=0, driver=08 
sd: Current: sense key=0x2
    ASC=0x4 ASCQ=0x0
sda: test WP failed, assume Write Enabled
sda: asking for cache data failed
sda: assuming drive cache: write through
sda: Spinning up disk.......................................................................................................not responding...
sda : READ CAPACITY failed.
sda : status=1, message=00, host=0, driver=08 
sd: Current: sense key=0x2
    ASC=0x4 ASCQ=0x0
sda: test WP failed, assume Write Enabled
sda: asking for cache data failed
sda: assuming drive cache: write through
 sda:<6>sd 0:0:0:0: Device not ready: <6>: Current: sense key=0x2
    ASC=0x4 ASCQ=0x0
end_request: I/O error, dev sda, sector 0
Buffer I/O error on device sda, logical block 0
sd 0:0:0:0: Device not ready: <6>: Current: sense key=0x2
    ASC=0x4 ASCQ=0x0
end_request: I/O error, dev sda, sector 0
Buffer I/O error on device sda, logical block 0
sd 0:0:0:0: Device not ready: <6>: Current: sense key=0x2
    ASC=0x4 ASCQ=0x0
end_request: I/O error, dev sda, sector 0
Buffer I/O error on device sda, logical block 0
ldm_validate_partition_table(): Disk read failed.
sd 0:0:0:0: Device not ready: <6>: Current: sense key=0x2
    ASC=0x4 ASCQ=0x0
end_request: I/O error, dev sda, sector 0
Buffer I/O error on device sda, logical block 0
 unable to read partition table
sd 0:0:0:0: Attached scsi disk sda