I have had Series 2 and TivoHD devices, upgraded them all to 1TB and therefore know a little about disks and Tivo. I've searched here, but did not find clues - just the statement this is drive 99% of the time ... seems like I might be in the 1% - but what causes the 1%, can't find clues - anyone have ideas ? Symptoms/Steps so far Current TivoHD started 'glitching' yesterday - recordings and Live. Appears to be read as glitch position is inconsistent. So, ordered a new drive (on it's way) and swapped original 160GB drive in tonight to try to ensure current drive does not fail completely before I can save the content. Boots up, updates the software to the latest version. Boots and I switch it to Live TV. It's glitching - same symptoms which are very short video freezez accompanied by an audio buzz (like the sound is stretched) ... as well as occasional audio buzz (sounds exactly like Americas Got Talent 'X' sound) but no visible video glitch. Original drive has been on shelf for probably 3-4 years, but seems rather remarkable that both drives would behave the same ... So - anyone have clues as to what else might be failing ? I have a totally unused 652160 on the shelf, so have all replacement parts - of course I can't just swap mobo in as the crypt id will be different - so Lifetime will be lost, as well as all current recordings. Any ideas from the bright folks here ???