I have been using an external hard disk for my Mac mini for almost 3 years. I used this for my EyeTV recordings, iTunes movies / musics. However, I had since then 2 different hard disks broken down. The first one was a LaCie for Mac mini and the second one is a Western Digital MyBook. I thought that having an energy save feature on the WD MyBook will help preventing this kind of situation. Anyhow, it happened that soon again. Do you have the same experiences?