Safely using a hard drive dock

view full story

http://unix.stackexchange.com – I just pick up an Ez-Dock HD dock 2535. It came with sparse instructions ( and as usual Windows centric ). Software wise ie mounting, syncing,unmounting is not a problem. Hardware wise though I am uncertain of what order I can do things and be safe. This particular dock comes with a USB port ( eSata too but I won't be using it ), power supply, power button, sata power and data. Oh and a "one touch backup" button. So under what circumstances can I use this without causing damage? For example can I place a drive in the dock while power is on and the USB is connected? What removing a drive. Is (HowTos)