This utility works great for my macmini media center. I have several maxtor and seagate drives connected and they constantly spin down and it was causing frequent beach balls. This was especially frustrating when accessing the machine over the network. Keep Drive Spinning does just that and I like the fact that it allows you to set a different interval for each drive. The other utility that does this job (No Spin) only allows one interval to touch all the drives. My concern is that this would put an unnecessary load on the system at each of those intervals (if you have several disks for it to maintain). Perhaps the overhead is minimal, because it's just briefly touching the drive, but I feel as though it's smarter to spread out the tasks. Especially because my focus with my media center is the best HDTV playback experience possible.