My B&W has two IDE disc, it is a rev. B so no problem here, disc one is a IBM 60 GB (7200 rpm, 2 MB cache), second is a WD 80 GB (7200 rpm, 8 MB cache), the trouble is that the WD is noisy, too noisy when it is spining, so I would like to put the WD at sleep instantly, are there any app to do it ?
Note that I have no sleep issue with the Western Digital and my B&W, I can put the Yosemite to sleep every time I want.