Intel matrix storage manager: Error Occurred(0)

Each time I started my PC, one of the boot-up screens was showing an error (edited):

Intel matrix storage manager Rom v5.1.2.1002 ICH7R wRAID5
Hitachi HDP72505 S/N: GEA530RE3YJRBA 465.8GB
Drive 0: Normal
Drive 1: Error Occurred(0)

Since my PC was still working, and I my hard disk was showing more than 465.8GB full, then the second physical drive must be working OK, despite the error message.

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