Event ID 1003 system error

We have a Windows 2003 R2 Std SP2 server. It is a file server and domain controller.
Every so often (2 to 5 weeks) it reports event ID 1003 in system log. There are 2 different errors I see as shown below:

Error code 00000077, parameter1 c0000185, parameter2 c0000185, parameter3 00000000, parameter4 1daef000.
Error code 0000007a, parameter1 c06017c8, parameter2 c0000185, parameter3 c02f94e0, parameter4 29da4884.

Both errors seem to point to STATUS_IO_DEVICE_ERROR.
I had Dell check logs and found no hardware issues. Dell suggests updating firmware and drivers.  

I do not see any other error besides this event so if it is not a critical issue, I would like to avoid firmware update unless necessary.

Does anyone have any input as to what is happening and how to address this?

Thank you.
realtimerAsked:
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Lee IngallsDirector of IT/TS, Quality and FinanceCommented:
What is your disk controller and hard drive configuration?
I'd also consider memory diagnostics... MemTest
http://www.memtest.org/
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realtimerAuthor Commented:
Perc6i integrated controller. RAID1 (2x72GB SAS), RAID5 (4x146GB SAS).

Thanks.
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Windows Server 2003

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