Turned-off external drives remain active and spin ...any risk?

I have several USB-hard-disks connected via USB-hub to my MacBook. The power for each drive can be turned on individually. I noticed that drives are still spinning though power has been turned off (but they don't mount on the desktop). So I guess that the drives draw current via the USB-contacts. Set aside the point of wasting electric energy is there a true risk for the USB-hub or even worse - what happens if I connect a turned off drive directly to the MacBook ... is it "just" sucking some energy or is this stressing the units involved?

Hi Michael,
Thanks for your input on this. I went through several steps, including most of the ones you recommended, and came upon what seems to be the problem (knock on wood).
My editing setup is one MacPro, 4 G-Raid drives, and one Sony DSR-11 digital video deck. After clearing up more space the G-Raid drives to bring them to about 10% free space, things seemed to be running smoother - there were less crashes within FCP. However, I was still getting crashes on opening FCP, at the same "splash screen" point (after all the AE Effects and Video Effects had loaded).
Running Disk Utility on all drives showed no problems, and unfortunately I don't have DiskWarrior (though that may be an upcoming purchase).
It wasn't until I went through your suggestion of starting FCP with the individual drives connected that I got somewhere. FCP would start up fine with one or even two drives connected, but not with three or four. Doing a little research on that brought me to two threads on Creative Cow about G-Raid drives and daisy-chaining:
http://forums.creativecow.net/thread/176/856609
http://forums.creativecow.net/thread/176/856570
Once I put two of the drives onto the rear FireWire800 port, and two of the drives into the front FireWire800 port, with the DSR-11 still in the back FireWire 400 port, my problems disappeared. Huzzah! The G-Raid folks recommend no more than three FireWire devices connected at a time, and lightening the load on the FireWire port by uncoupling the four-drive long daisy-chain has immediately helped. Now, I'll keep an eye on it, and may potentially buy a PCI card if something goes wonky again, but I am very happy to have gotten things up and running again. Cheers!

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