External drive not shutting down

I have a 15" MBP running at 2.8GHz with 7200 rpm 500GB disk. This is a new set up, only installed in the last day or so. The MBP is attached to the Apple LED display to which is attached - via USB - a G-Drive Q 500GB external drive. The ext HD is used to store iTunes music and the iPhoto library. When I shut down the system the ext drive does not itself shut down but continues to whir (it sounds as though it starts to shut down but then changes its mind). However, if I put the system to sleep it does shut itself down.
I'm not happy about leaving it all night whirring away and whilst I can manually switch it off this is not something I've previously experienced with other HDs. Any ideas, folks?

If you don't mind pasting the G-Tech rep's response in here, I would indeed be interested in reading it for my own edification.
Interestingly, ejecting the disk causes it to spin down - of course - but as soon as you remove the USB cable from either the MBP or the display the ext drive starts up again.
The drive's enclosure (actually the bridge chipset that it contains) is engineered to make the reasonable assumption that when you "eject" the disk, you're finished with it and you intend to switch it off. There may be nothing in its documentation that says this, but I suspect it's also designed to assume that you'll switch it off before unplugging its USB cable from whatever port it's connected to. If you do that, of course the drive can't spin up again when you unplug the USB cable. My experience suggests that connecting or disconnecting any USB device sends some kind of signal — just the merest blip — over the USB bus, with the result that whatever is sleeping wakes up: the computer itself, the hard drive that's been connected or disconnected via USB, and any other connected USB devices that are in sleep or standby mode (as your hard drive is when it's powered on but not spinning). The sheer variety of extant USB devices, with new ones and new classes of them appearing all the time, makes it understandably difficult to provide a uniform set of rules to which every such device will (or can) adhere.
Any or all of the following may be true — I'm not certain which:
- The USB standard doesn't specify a set sequence for hard disk spin-down, power-off, and disconnection and all the possible permutations thereof, and the precise manner in which a drive should behave when that sequence is or isn't followed.
- If it does specify all that, not all external drives adhere scrupulously to the specification. (I know for a fact that not all external drives behave the same.)
- Occasionally a user fails to read all the documentation that comes with his device to find out how it's supposed to work. Yes — a shocking idea, barely conceivable!
So I think as long as you can find a sequence of steps that allows you to shut down or sleep all your devices when you want to without losing any data, you'll just need to follow that sequence each time, regardless of whether it all makes sense to you (or me ) or is as convenient as you might wish.

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