Comment 4 for bug 99189

From your '/var/log/messages' file:

Mar 28 20:09:25 prokofiev kernel: [17593667.872000] hda: command error: status=0x51 { DriveReady SeekComplete Error }
Mar 28 20:09:25 prokofiev kernel: [17593667.872000] hda: command error: error=0x50 { LastFailedSense=0x05 }
Mar 28 20:09:25 prokofiev kernel: [17593667.872000] ide: failed opcode was: unknown
Mar 28 20:09:25 prokofiev kernel: [17593667.872000] end_request: I/O error, dev hda, sector 297244

I imagine hda is your primary hard drive. In my experience errors like this are indicative of hardware problems and possible failure. There is a package called smartmontools that contains "two utility programs (smartctl and smartd) to control and monitor storage systems using the Self-Monitoring, Analysis and Reporting Technology System (S.M.A.R.T.) built into most modern ATA and SCSI hard disks." I recommend using smartctl with your drive and see what it says. Thanks.