I've been having random reboots as well, pulled the HD and replaced it with the old one to verify it was the HD. Everything has been working, so I was putting the upgraded HD back in to see if I could narrow down the problem by testing the record ability if I only did 5 minute programs. I added 2(just like you) and then got this error message. Now it is not randomly rebooting, but it never recorded my 2 new programs and I still can't add anything. I think the system is corrupt on the HD and it is not a physical problem. I just hate to blow away all my saves and have to start from scratch.
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