Непонятки в log/messages

Что вот это обозначает

May 27 16:58:41 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0

May 27 16:58:41 server kernel: ata1.00: (irq_stat 0x40000001)

May 27 16:58:41 server kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 0

May 27 16:58:41 server kernel: res 51/04:00:00:4f:c2/00:00:00:00:00/00 Emask 0x1 (device error)

May 27 16:58:41 server kernel: ata1.00: configured for UDMA/133

May 27 16:58:41 server kernel: ata1: EH complete

May 27 16:58:41 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0

May 27 16:58:41 server kernel: ata1.00: (irq_stat 0x40000001)

May 27 16:58:41 server kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 0

May 27 16:58:41 server kernel: res 51/04:00:00:4f:c2/00:00:00:00:00/00 Emask 0x1 (device error)

May 27 16:58:41 server kernel: ata1.00: configured for UDMA/133

May 27 16:58:41 server kernel: ata1: EH complete

May 27 16:58:41 server kernel: SCSI device sda: 625142448 512-byte hdwr sectors (320073 MB)

May 27 16:58:41 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0

May 27 16:58:41 server kernel: ata1.00: (irq_stat 0x40000001)

May 27 16:58:41 server kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 0

May 27 16:58:41 server kernel: res 51/04:00:00:4f:c2/00:00:00:00:00/00 Emask 0x1 (device error)

May 27 16:58:41 server kernel: ata1.00: configured for UDMA/133

May 27 16:58:41 server kernel: ata1: EH complete

May 27 16:58:41 server kernel: sda: Write Protect is off

May 27 16:58:41 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0

May 27 16:58:41 server kernel: ata1.00: (irq_stat 0x40000001)

May 27 16:58:41 server kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 0

May 27 16:58:41 server kernel: res 51/04:00:00:4f:c2/00:00:00:00:00/00 Emask 0x1 (device error)

May 27 16:58:41 server kernel: ata1.00: configured for UDMA/133

May 27 16:58:41 server kernel: ata1: EH complete

May 27 16:58:41 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0

May 27 16:58:41 server kernel: ata1.00: (irq_stat 0x40000001)

May 27 16:58:41 server kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 0

May 27 16:58:41 server kernel: res 51/04:00:00:4f:c2/00:00:00:00:00/00 Emask 0x1 (device error)

May 27 16:58:41 server kernel: ata1.00: configured for UDMA/133

May 27 16:58:41 server kernel: ata1: EH complete

May 27 16:58:41 server kernel: SCSI device sda: drive cache: write back

May 27 16:58:41 server kernel: ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x0

May 27 16:58:41 server kernel: ata1.00: (irq_stat 0x40000001)

May 27 16:58:41 server kernel: ata1.00: cmd b0/da:00:00:4f:c2/00:00:00:00:00/00 tag 0 cdb 0x0 data 0

May 27 16:58:41 server kernel: res 51/04:00:00:4f:c2/00:00:00:00:00/00 Emask 0x1 (device error)

May 27 16:58:41 server kernel: ata1.00: configured for UDMA/133

May 27 16:58:41 server kernel: ata1: EH complete

May 27 16:58:41 server kernel: SCSI device sda: 625142448 512-byte hdwr sectors (320073 MB)

May 27 16:58:41 server kernel: sda: Write Protect is off

May 27 16:58:41 server kernel: SCSI device sda: drive cache: write back

May 27 16:58:41 server kernel: SCSI device sda: 625142448 512-byte hdwr sectors (320073 MB)

May 27 16:58:41 server kernel: sda: Write Protect is off

May 27 16:58:41 server kernel: SCSI device sda: drive cache: write back

May 27 17:01:01 server rotated[4897]: Roatation finished. 0 log files was processed. 0 seconds left