External hard drive wont sleep

Hi there
I have a a G-Drive mini for time machine backups on an brand new MacBook Pro 15" connected with Firewire 800. Time machine works well, but the hard drive never sleeps. I think it should, cause time machine only runs once an hours, whats ok. In the meantime it runs for nothing, using power and producing noise and hot air.
Thanks a lot for any helping comment!

System Preferences>Energy Saver. Click the box "Put the hard disks to sleep when possible."

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Please post the HP product number for your PC. How to Find the HP Model Number and the HP Product Number or let HP automatically find your PC model number and HP network attached printers. This will allow others to review your issue, make suggestions and review your responses. This is usually the best way to get assistance.
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