Am experimenting with external drives as boot drive for Roamio. Direct connection from motherboard to drive in enclosure, using the external case as power for the drive.. Everything seems to be working fine. But here is the question, powering up/down devices. Logic says when powering up turn on the external drive first, then power up the Roamio. When shutting down I'd say put the Roamio into standby (which should put the external into standby?), power down the Roamio, then power off the external drive? That is how I have been doing it. My question is, as one of my "external" drives I used a new 3TB PMR drive. After powering up/shutting down a few times I went to check the drive for errors even though everything seems fine. No major errors BUT did see some Ultra DMA CRC errors. From what I understand these can be caused by a drive losing power at the wrong time. Can this be a problem using an external drive as boot drive for a Tivo? Is the method I use for shutting down correct, put the Tivo into standby, unplug the Tivo, then power down the drive? Not the same as shutting down a computer, the OS shuts the drives down correctly before powering down. Thanks.