Hi Mark
Yes. Those are the classic symptoms of a failing hard disk. I suggest you either get the utilities available from your hard disk manufacturer's website or a good 3rd party diagnostic software utility that can do a complete surface scan. The one in Windoze is no good for testing TiVo hard disks properly.
Alternatively simply image and set up a test hard disk. Anything from 4GB and up will do. If this works with no jerky issues then your problems are your hard disk.
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