I just got an external HD (160GB USB Freecom) and I noticed that when it's connected to my mac, there's a great deal of system activity (which is annoying because the fans go crazy). Activity monitor shows a lot of blue lines (niced tasks) which go down (and everything becomes normal and quiet again) when I disconnect the HD. Anybody else has this problem? Any solutions? The thing is, the HD should be connected because I want to use it for automatic backups. If I connect and disconnect every time, it would defeat the purpose of automatic backups... EDIT: I decided not to be too lazy and wait for an answer here, so after investigating a little, it seems it's spotlight indexing the backup volume.