Keep us up-to-date!

I'm seriously considering doing this but have to decide if I want to get new drives or not... I have one untouched DTivo that I'll try first. But on my other DTivo, it has a 120gb 2nd drive. I paid weakknees.com for it already formatted but it looks like I'll have to wipe that drive and start from scratch? Or can I get 4.0 on the "main" drive and pop the 120 back in?

Looks like I have more reading to do!
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Brad B.