AVS Special Member
Join Date: Mar 2007
Location: Long Beach, California
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The USB protocol has a command to spin the drive down, but many USB->SATA chips do not support it, and I doubt if any streamers would support it. But most chips support spinning the drive down when USB 5volts goes away, but some USB enclosure manufacturers don't implement it.
I also use the WD Element drives (1TB) for backing up my NAS. The NAS's spin-down logic was flawed, so most external drives I tried would spin constantly, which is really stupid for backup. The WD Element has an inbuilt sleep-mode that spins the drive down after about 20 minutes of inactivity.