http://seer.support.veritas.com/docs/243636.htm
generally means that tere could be a Hardware / software issue ,
Try going to event viewer ( Rightclick my computer ...manager ---event viewer ...system event and check for evnt ids : 7/9/11, and wsee what evnt has a frequent occurence)
For additional info refer : http://support.microsoft.com/kb/154690 How to troubleshoot event ID 9, event ID 11, and event ID 15 error messages
Generic trouble shooting would be to check cabling/ Firmware updates for SCSI card / re swapp of the dev ice ( Shutdwon/ Swap out and re-swap in ) ---
Furher if similar events occur get Hardware vendor to look in same...