I have two hard drives in my mac. The original HDD and a SSD. The SSD is set as the boot drive with the OS and all apps on it. The HDD has just my user folder. I have the system set to sleep hard drive(s) whenever possible. My hope is to have the HDD sleeping most of the time to conserve power. The problem is, it is always active. Example: for the last 30 minutes, I have just been browsing the web. Adium and Safari are the only apps open. I have not saved any files. Yet the the HDD has been active the entire time. I am curious why this is, and what I can do to get the HDD to sleep.