failed command: READ DMA
status {DRDY ERR}
error {UNC}

ubuntu@ubuntu:~$ sudo fsck.ext4 -fyv /dev/sda1
e2fsck 1.41.14 (22-Dec-2010)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information

  636405 inodes used (6.60%)
    1150 non-contiguous files (0.2%)
     509 non-contiguous directories (0.1%)
         # of inodes with ind/dind/tind blocks: 0/0/0
         Extent depth histogram: 597621/150
11860707 blocks used (30.77%)
       0 bad blocks
       1 large file

  527261 regular files
   58777 directories
      59 character device files
      26 block device files
       0 fifos
     505 links
   50243 symbolic links (38509 fast symbolic links)
      30 sockets
--------
  636901 files

Thanks,

David