It doesn't seem that it's a global problem with WD GP drives because other models (to date) are not exhibiting the problem of not booting up entirely. In addition power saving mode generally occurs when a drive is inactive for a pre-determined amount of time. Since TiVo drives are active 24/7 it shouldn't be an issue even if the WD drives employed that option. Not saying that problems with other drives (WD or others) won't occur in the future, but it doesn't seem likely that the problem is anything more than a production change or as you mentioned possibly a batch of bad drives (although if they are "bad" it doesn't seem likely that they would work in PC's either which they apparently do). Still a mystery.