Make External Drive Sleep?

New Macbook Pro with Mountain Lion, which spends most nights plugged in, with an external drive attached for Time Machine backup.
My former backup drive, a Seagate Freeagent Go, would go to sleep whenever my laptop was asleep, or when ejected. When the computer woke up, the drive did too and all was well (unlike the problems a few users seem to have had with drives not waking).
I recently installed a 512GB Crucial SSD (MS PowerPoint opens in about 1 second!), and moved the TOSHIBA MK7559 750 GB drive that came inside the Macbook Pro to an external USB3 case, so that I would have a bigger backup capacity. It works very well for backup, but the drive keeps spinning even if the computer is asleep, and even after being ejected. The check box in Energy Saver Prefs is checked to allow drives to sleep when possible.
It is almost certain that problem is with the drive case's firmware, not with my Mac or the OS. What I am looking for is a workaround. Is anyone aware of any utilities that might let me force it to spin down? I am concerned about the long term reliability of the drive if it keeps running 24 hours a day.

Most of the time this feature is built into the Drive Enclosure and has nothing to do with the operating system running the computer.
So it would seem the enclosure you have does not support such a feature.

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