[CentOS] errors received in logs

> hda: drive_cmd: status=0x51 { DriveReady SeekComplete
> Error }
> hda: drive_cmd: error=0x04Aborted Command
> 

Errr... might be a silly question, but you
didn't make it absolutely clear.

Here's my start up message......

=====================================================
hda: set_drive_speed_status: status=0x51 { DriveReady SeekComplete
  Error }
hda: set_drive_speed_status: error=0x04
=====================================================

ahh, but missing the most important line of all right
above it.....

hda: COMPAQ CD-ROM SN-124, ATAPI CD/DVD-ROM drive

Are you running SCSI?

Are you sure the your main hard drive is "hda"?