I have a Tivo HD (TCD652160) and it's been doing random reboots. Initially, I did a SMART test on the drive and it seemed ok so I figured it might be the power supply. I got a new power supply but it's still happening. I did another SMART test last night and it passed. So I tried to do the "overnight automated test" and I got an error:

Confirm /dev/hdb
Cannot access /dev/hdb
Drive not present or not responding!

But there is no external drive so it shouldn't be trying to test /dev/hdb right? How can I run the overnight test?

Should I try to clear and delete everything?

Thanks,
Phil