Originally Posted by dsmith901
. . . the older 250GB model, shuts down when the PC is off, but the newer and larger 2TB model does not.
Originally Posted by Slosh
FWIW, I tried an old 320GB WD USB drive with my NTV550 and it too powered on and off with it.
Is it possible that the PC leaves power on the drive's USB port when the PC is off? This is often an option to allow USB wake-up.
I suspect the Seagate is spinning down the drive when it sees USB power go away. The NTV550 does not leave power on the USB, which is probably why it works for Slosh. You could try another USB port, or see if there is a configuration option in Windows or in your BIOS (I don't remember where I configured mine).