Ok so, I have a unibody Macbook, I recently switched from PC two months ago. With my old pc laptop when I got home, I would plug in my monitor, usb hub and power adapter. Then, when it was asleep before I left for work I would unplug everything without even starting it up. This worked fine for a while, until I switched to Mac. It seems OS X does not like it when you just disconnect things (mainly the external HDD, for time machine, that is plugged into the above mentioned USB hub). Everytime I get to work, I get a "OMG YOU DISCONNECTED SOMETHING WITHOUT EJECTING IT FIRST!!!!!" message. Now, my time machine backup is corrupt. This brings me to my main question. Is there anyway to make time machine mount an external HDD to make it's backup and then unmount it when it is finished? That way I would not have any problems with unplugging the hub.