Can I use any eSATA external hard drive, or only...

the WD mybook drive?

I guess that I'd like to get a larger drive. I know there is another thread on external HD, but it does not definitely answer this question.

If possible, which other larger external HDs would you recommend?

I'm buying my Bolt at BestBuy tomorrow, getting tired of my old TWC DVR. I already have the cable card. Hoping setup will be easy.

Thanks for any advice.