I'm not what to call this, barely how to describe it, so if this has been answered elsewhere, I'd appreciate being pointed that direction. The problem: I have a 2011 iMac (which I love) but there is a little hitch in the giddy up that drives me partially insane. Several times a day, if I go to save/exit a program (typically Pages, since I spend most of my life in pages) but it has also happened with Text Edit, Mail, Tweetdeck, and Safari, and when I select Quit, everything freezes for about ten seconds. What happens during these ten seconds? Well, I have a Western Digital external (usb) hard drive where I back up the local drive via Time Machine, and when this pause happens, that hard drive spins up and starts running. I know this because the drive is sitting on the desk beside me and it vibrates. Occasionally this happens when I open a new page in Safari, too. It's like the system pauses to call to the hard drive for some reason, but I don't know why that would be the case. I don't store files or any information, that I know of, on that drive, and it isn't starting up for an actual Time Machine backup...any thoughts?