Hi, I've a Mac Mini 2012 and have recently added a second drive and created a 'Fusion' volume with a 256 SSD and a 1TB WD HDD. Everything is working fine except that I can hear the HDD spinning down every few minutes, and then after about five seconds it spins back up again. I was under the impression that the HDD should be spinning constantly in a Fusion drive ? I'm worried that I'm going to reduce the live of this drive considerably by having it spinning up/down all the time. Does anyone know a way I can keep this drive spinning ? I've changed the System Preferences - Energy Saver - Put Hard drives to sleep when possible but it doesn't make any difference. The drive is a Western Digital 1TB 'Blue' drive (WD10JPVX). I'm thinking there might be a utility out there that could alter some SMART setting or other on the drive to keep it spinning. Would be very grateful to hear from anyone with any ideas! Jason.