Some units (like my Sony Series 1) can have a second drive added, the unit then "maries" the drives into one virtual drive. From that point on, "divorce" involves starting over. You can't just substitute one drive for another.
But I see no reason why you can't replace one or both, so long as the new drives (or re-used) drives are "blessed" accordingly. A friend has done a few hard drive swaps on his S2 over the years, as one drive got noisy, and concerns about heat and power consumption with the dual drives prompted the installation of a new single higher capacity drive. Glen ----- Original Message ----- From: "Mike Thomas" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, July 06, 2008 11:50 PM Subject: Re: [TiVo Central] Freezing Tivo fixed > FWIW I discovered (possibly on this group, not sure now) that once a > TiVo's > hard drive has been upgraded once, it cannot be upgraded again. The MFS > tools create new partitions (rather than increasing the size of existing > partitions), and you hit the limit on the number of partitions you can > have. > > I successfully used WinMFS (MFSLive) to do the upgrade (and it felt a lot > faster than I remember the previous upgrade was). > > Mike
