IO Errors

[142394.923284] end_request: I/O error, dev sda, sector 599231200
[142394.923309] ata1: EH complete
[142572.241064] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[142572.241070] ata1.00: irq_stat 0x40000001
[142572.241074] ata1.00: failed command: READ DMA EXT
[142572.241081] ata1.00: cmd 25/00:08:e0:8a:b7/00:00:23:00:00/e0 tag 0 dma 4096
in
[142572.241083]          res 51/40:08:e0:8a:b7/00:00:23:00:00/e0 Emask 0x9 (medi
a error)
[142572.241088] ata1.00: status: { DRDY ERR }
[142572.241091] ata1.00: error: { UNC }
[142572.352273] ata1.00: configured for UDMA/133
[142572.352308] ata1: EH complete
[142584.326997] ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0
[142584.327004] ata1.00: irq_stat 0x40000001
[142584.327008] ata1.00: failed command: READ DMA EXT
[142584.327015] ata1.00: cmd 25/00:08:e0:8a:b7/00:00:23:00:00/e0 tag 0 dma 4096
in
[142584.327017]          res 51/40:08:e0:8a:b7/00:00:23:00:00/e0 Emask 0x9 (medi
a error)
[142584.327021] ata1.00: status: { DRDY ERR }
[142584.327023] ata1.00: error: { UNC }