I can only confirm that I am using 2 x 500GB Seagate Barracuda 7200RPM Drives. ST3500320AS are the part numbers.
The only thing I notice is that it struggles sometimes to remain completely stable. Every now and again I get a few jitters in the playback of video. I assume it is because it has to search the entire 1TB for data. It is also a little slow using the menu system now, and it has only happened since upgrading the drives, although I am not sure why, I thought the cache card was supposed to bypass uisng the hard drives for the menus.
TiVo Series 1 (Phillips) - 500Gb, 512Mb Cachecard, Foxtel Digital Cable
TiVo Series 1 (Sony) - 250Gb, Turbonet Card, HAILO 8000 HD STB
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