Disk Event ID 11 and 51 errors on Server 2008 R2

I am getting some Disk errors on very rare occasions. On 11/19/13 there were 5 Disk Event ID 11 errors within seconds of each other while updating some firmware with Dell:

The driver detected a controller error on \Device\Harddisk2\DR3.

And on 12/5/13 (and previously on 6/19/13) there were Disk Event 51 errors on server restart:

An error was detected on device \Device\Harddisk2\DR2 during a paging operation.

The strange thing is that there is no Harddisk2 in Disk Management - there is a 4-drive RAID 6 array (disk0) and an internal RD1000 RDX drive (disk1). There are no external drives or flask drives appearing in Disk Management or under Computer (I am not onsite bad had local staff verify there are no other drives connected).

How can I locate the drive that is generating these errors?

Thanks
fisher_kingAsked:
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Davis McCarnOwnerCommented:
Disk Management will show you the drives in the order they are enumerated and I'll bet the third drive is your optical drive which is getting tired and flakey.
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fisher_kingAuthor Commented:
DVD drive is the third (as you suspected) - but the server's less than 1.5 years old, and there is no disc in it. I will check with Dell and run some diagnostics and let you know.

Thanks for the reply.
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Davis McCarnOwnerCommented:
It doesn't need to have a disc in it to have a controller error and it does get queried on a regular basis.
I have an older Pioneer DVD that has complained the same thing for years; but, still worked when I asked it to.
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fisher_kingAuthor Commented:
I can't find any issues with the drive, but assume it's the cause.

Thanks for the help.
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