My previous thread is resolved. My 160GB drive only appeared to be failing because it was full. That problem is solved, though I've lost all the TV shows. No worries, though. There are ... other ... ways to find shows I've missed. When I thought my drive was failing, I ordered a new 160GB drive. Now that it has arrived, I decided simply to add a 2nd drive, doubling my recording capacity. I used WinMFS to perform the mfsadd function. WinMFS claimed that everything was done, and I went to my Tivo (Series 1, standalone, Philips HDR112) and installed both drives. I plugged in the power. My TV screen immediately flashed up the happy little Tivo guy with the words "Your recorder is starting up." I waited. And waited. After 15 minutes, I did a hard reboot, pulling the power cord and plugging it back in. I waited. And waited. More than an hour and still the same "Your recorder is starting up" screen. I shut it down, pulled the drives, put them back in my PC, ran WinMFS, and "divorced" the drives using mfssplit. Put the A drive back in the Tivo. It booted just fine. Glad to know I didn't break anything, but really? What am I doing wrong?