External Drive Won't Automatically Sleep

I have a Seagate BackUp Plus 1TB external hard drive connected by USB 3.0 to my iMac running 10.10.1. The external hard drive will not automatically go to sleep when the energy saver settings put the iMac to sleep, but it will sleep if I manually put the iMac to sleep. I added a new Brother wireless laser printer replacing a similar printer but older model, but with a new driver. That is the only change I've made other than updating Flash for Safari. Neither of those changes seem likely to be the cause of my hard drive sleep problem.

Colin,
No solution for you, but I just want to add that I installed a MyBook Studio II a few days ago and I have exactly the same problem. Didn't have time to investigate a lot yet.
Latest Snow Leopard on my Mini.

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