The folks over at TiVoCommunity.com have compiled a Series3 eSATA FAQ.
But the most interesting bit, to me, is the link to this post. dt_dc noticed that CableLabs just recently (4/20/07) revised their DFAST licensing agreement to allow vendors (such as TiVo) to support external storage (eSATA, USB, FireWire, etc) without explicit CableLabs approval. So it sounds like TiVo could introduce *official* eSATA support when the want to now – which I hope would be *soon*. Of course, there is no way to know if the current back door eSATA support meets the new guidelines, which would make turning it on officially seemingly simple, or if TiVo would have to rework what they’ve already done to meet the guidelines. This does offer more hope that TiVo won’t clamp down on the back door and disable it, at least.