Instruction: Answer the given question using the supporting document.

Input:
Question: Compatible with TiVoHD? The product description says "Compatible with TiVo".  Does that mean it is compatible with all Tivos, such as the TivoHD?
Document: Product does exactly what it says. This product was backordered everywhere for over six months since last November '09 possibly due to errors encountered/reported by users. The company finally provided some driver updates and is now available again and it works perfectly. Just attach it to your TiVo HD with the included esata cable and then TiVo will ask to reboot, when the system comes up you'll have more storage space. Completely effortless.
I can't say enough good things about this product. The only way it could be better is if cable companies gave you one for free when you get DVR service.If you have a compatible DVR or Tivo and need more space to record your favorite shows, this is the best product I've seen. Buy one right away ... you'll be glad you did.
Overseas buyers beware!I purchased the unit for my Tivo 3 series in Australia. The small print on the WD packaging & WD website stated it was compatible with Series 3, not in my case.I followed the installation instructions to the letter 6 times & kept receiving the same message "External drive attached NOT compatible".Tivo & WD in Australia both advised they do not support the product as it was not purchased in Australia.
Also note that most Tivos don't recognize drives over 1TB, so spending more won't help you.If you really want to get into the details of upgrading your Tivo storage, look here: [...]All my info is current as of Spring 2009. Things change.
This is the ONLY drive that works with my HD Tivo. I bought another drive that said on the box it was compatible, but it was not. We now have more recordable space than we can use.
I bought this 1TB Western Digital drive about two weeks ago and so far so good. Installation went smoothly although it took about half an hour before the TiVo was back up and running. Based on other reviews about the ESata cable I bought a third party cable that did appear to be of better quality than the one supplied with the drive. There is some incorrect information out there that says you only get 120 hours of HD recoding capacity but you actually get 160 hours of HD capacity.
I've always been a fan of WD hard drives so I was sure that the quality problems with this 1TB expander were blown out of proportion, so I had no problem ordering one...Lo and behold, 10 months after I installed it, the Tivo HD started randomly rebooting itself. I ran the diagnostic tests per Tivo support's instructions and it failed with flying colors. "Fail 7" it says...  Awesome.One good thing is that WD makes it easy to return your drive.
When I receieved this item, I was extremely excited. I couldn't wait to hook it to my HD Tivo. After hooking it up exactly according to directions (it's only the order of hookup)...Nothing. No recognition, no eSata expander recognized. But wait...there are all these Tivo compatible stickers. It must be a mistake or defective. After calling Tivo and trying a secondary way to boot (hold down pause + hit this & that), still NOTHING.
The bad news from Tivo was that they despite the stickers, it wasn't on the list of compatible WD expanders. WHAT???? IS THIS A CRUEL JOKE? I'd like both their stocks to tank or worse. This is my last Tivo. Tivo for excluding regular external drives and forcing us to buy WD, and WD, for SAYING IT'S COMPATIBLE, PUTTING ON STICKERS WITH THE TIVO LOGO AND LYING! I heard it right from Tivo. This device "isn't on the compatible list". FCP
I record a huge number of shows on 4 Tivos (2 HD & 2 Series2). My daughter is out of state at college for 9 months out of the year and doesn't have time to watch much tv during the school year. During this last semester I have been able to record her favorite shows and save them. Now she's home for the summer, and can get caught up on everything.I've even ordered a second Western Digital 1TB My DVR Expander Hard Drive for my second Tivo HD.
Answer: I managed to order this before it was supposed to be released; it must have been a glitch on the Amazon.com site.  I have a TiVo HD with the latest firmware and the device is not supported.  TiVo support is not being very helpful and neither is WD.  Disappointing.