I think that FAQ entry is misleading Tony. Possibly the "failed to unmask ide" can be caused by low power, but it can also definitely be caused by cold.

I have a empeg "blessed" power supply on my desk at work, but when my unit is cold (after sitting in the foot well of the car on cold mornings) I always get the "failed to unmask ide" message on the first attempt to start it. The disk does not spin up quickly enough on the first attempt.