Mac Pro Internal Drive randomly disappears on boot up

I have a nearly two year old Mac Pro and the non boot internal hard drive has started to randomly not appear. When it doesn't show up, I have to boot the machine from the Leopard DVD to get it to reappear. I run the disk utility and it shows no problems.
What is happening and how can I prevent this from reoccuring?

Hi H_Factor73,
I have a very similar situation happen to me a little while back. In my case, I should have been more alert. I had to much faith in risking not backing everything of that particular HDD up. The entire disappearing act was a warning that it was failing but I thought all would be fine anyway. It kept pulling the disappearing act randomly and coming back from time to time. I don't know how it happened or what the culprit was or why but one of the HDD failed big time in the end...
I tried Disk Warrior for recovery which worked wonders the first time for me. To make a long story short, the HDD in question died and I did lose some data. I brought it back to the local vender who was very understanding and I got a complete refund. I got lucky. I since bought an extra external HDD (same brand which was Western Digital) and ALL my data is backed up now. Good luck finding your answers. I just thought I'd put in my 2 cents' worth.
Rio.

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