The 4 year old (upgrade) 2TB drive in one of my Tivos decided to stop working earlier this week.
I pulled the drive and ran Spinrite but it didn't find a problem. I reinstalled the unit and the Tivo would still not get past the initial "Starting" screen before endlessly rebooting.
I tried several different Kickstart codes but none of them would take. The system would just go back to a black screen and reboot. Oh well...
A different freshly imaged drive would work perfectly. (to verify it was the drive and not the MoBo or PS.)
So in an effort to get my recordings back I picked up a new drive from Newegg and ran WD Diags to verify it's a good drive. I then ran MFSCopy from within WinMFS to dupe the original drive contents to the replacement. It took over 8 hours, but once I installed the replacement 2TB drive, the Tivo HDXL was working again with all of the recorded programs there.
Now I guess it's time to wipe the old drive and re-purpose it.