Can I add a hard drive to a Tivo series 1


Check out one of these suppliers:

TiVo Upgrade Kits and Hard Drives
TiVo Upgrade and Repair Services Including TiVo Hard Drive Replacement

I looked up the Philips Series 1 box I have, but if you have another, then you can look it up by model number. If there is an upgrade kit then you're in luck.

Check out this thread:

Drive Expansion and Drive Upgrade FAQ - TiVo Community

I don't remember seeing anyone talking about upgrading a Series 1 themselves, but since there are upgrade kits, perhaps there is a do-it-yourself method.

I hope this helps.