I got this error in my event viewer along with these:
Event ID: 129
Description: Reset to device, \Device\RaidPort0, was issued.
Event ID: 11
Description: The driver detected a controller error on \Device\Harddisk0\DR0
Logged a case with HP and they asked me to run the Array Diagnostic Utility. After running the tool (no downtime is required), the report show this:
SLOT 0 Smart Array E200i Controller ERROR REPORT:
Array accelerator status:
Valid data found at reset
Hardware Problem detected with Cache board.
Please replace Cache board.
So, it confims that this is due to hardware error on the Cache board and HP is going to replace it for me.
Possibly a damaged drive or controller. Download the latest firmware from Compaq-HP and flash the drive(s) and/or disk controller. If that does not solve the problem, replace the drive to prevent data loss.