[ubuntu] LED on USB thumb drive?

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http://ubuntuforums.org – Not that this is a problem, but it's something I noticed. When I put a thumb drive in on a windoze pc the led on the drive comes on. When I unmount it the led goes out. Handy to know when the drive is completely unmounted. When I unmount in Ubuntu the led stays on. Is there an additional umount parameter, perhaps, to turn off the power to the device? Mac (Hardware)