Hey guys - I have 1TB My DVR Expander for my TivoHD that I have never used. I found that expanding the internal drive was enough recording room for me. Recently, I've been in need of an external NTFS storage drive and have avoided formatting the DVR Expander. My question is if I format it to NTFS and ever decide to use it as an External Tivo drive, am I able to do so? Will my TivoHD take care of formatting, etc? Or is it toast after formatted NTFS?