USB hard drive doesn't graceful power off after eject on Windows 7

USB hard drive doesn't graceful power off after eject on Windows 7 I have a couple of Seagate FreeAgent Go external USB hard drives and would like them to gracefully power off after ejecting in Windows 7.
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Guest [Entry]

"I believe that this a new ""feature"" in Windows 7, and the problem is with all USB disks, nor just with FreeAgent.

See also this thread for the same thing with other manufacturers.

EDIT: Microsoft now explains this feature and how to undo it in this article :
USB Port Remains Active for Disabled or Safely Removed USB Device.

This can be done per-device. I reproduce here the global setting for all devices, which is in registry key
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbhub\HubG,
new item DisableOnSoftRemove (DWORD), data value 1."