"I have purchased 2 drives from DVRUpgrade for Tivo Series 2 units. The first one lasted about 3 years before showing signs of impending failure (freezing requiring a reboot). The second drive was purchased on 7/11/2012 and failed catastrophically on 7/1/2013. There were no lightning strikes or power surges and all inputs (satellite, phone, power) to the unit are protected by a high quality surge protector.
I sent one email to DVRUpgrade of the situation and did not receive a reply. I sent a second "reminder" to them and they replied with a link to Amazon for a UPS unit.
The drive was less than one year old and supposedly covered by a manufacturer warranty. I asked them for assistance and to tell me what the warranty situation was, but they will not respond to emails and no phone number is on their website.
I would not recommend doing business with this company."