Advertisements I've done some more research on the EcoGreen drive and have concluded that my the assumption that the EcoGreen drive having a slower "spin-up" is the source of the hard boot problem is incorrect. For example, the Samsung HD103UI spins up in 12 seconds, whereas the "works OK" WD10EACS takes 13 seconds, probably because it rotates faster. It doesn't appear to be a power issue either in that the WD10EACS has slightly higher peak amps than the HD103UI at spin-up. I did a series of tests to see whether varying the time from power off to power on would impact the problem but couldn't find anything definitive. Out of 19 reboots, it failed 7 times (five gray screens and two never ending power ups) but there wasn't any observable reason for failures versus successes. I replaced my HDMI cable with a better quality one and thought I'd fixed the problem in that I got in 3 reboots with no issues. I then got a gray screen when I booted up the TiVo with the TV (Panasonic LCD) off initially and a hanging power up screen after I rebooted with a very quick power off/on sequence. I thought perhaps the problems were caused by those unusual factors but after a good reboot, I did get another gray screen when I hadn't done anything abnormal. I've now verified that the drive works perfectly for me once I'm past the initial boot and that with a maximum of a reasonable number of retrys I can do the hard boot OK. So I'm going to put the HD "into production" with the drive. But it does seem that installing this drive is a crapshoot and I wouldn't recommend it to anyone else since other options are available, although at a somewhat higher price today.