Drive Types? Ultra ATA, SATA, IDE????

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Drive Types? Ultra ATA, SATA, IDE????

I had my B drive fail and I am looking to buy a new HD replacement and would like some help. What kind of drive can I put in the Tivo? I have seen ATA, Ultra ATA, SATA, IDE, etc.

Of these what specific type(s) can I use?

Also, can I use disimilar size drives? "A" drive at 160gb and "B" drive at 500gb (Tivo System 7.1+)

Thanks :)