Hey everyone. I might be getting a new external hard drive in the next little while to replace my USB 2.0 external. I will be getting one with FireWire. I have an iMac so that is no problem. Now my questions are: I have my eyes on a Seagate FreeAgent Desk for Mac 500GB. It has FireWire 400 & 800, but it does NOT have a on/off button (power button). My current USB external has a power button. What are the negatives to not having a power button? I will use it for TimeMachine and I don't want it doing hourly backups to the drive (since it can't be turned off). I currently just turn my external on when I want to backup my data then I turn it off. Im not too fond of having it on all the time. So if anyone has experience with external HD's without power buttons please post your thoughts! Much appreciated!!