If you're going to get up and manually turn a switch.... why not just turn only one USB hard drive on at a time..... get up... walk over..... turn off EHD#1 and turn on EHD#2. Why introduce the complexity of yet another device?
Monoprice.com has one for $ 13.50
Use a USB hub, or plug one to the back and one to the front port. Just be sure only one is powered at a time.I guess I did not make myself clear. What I do not like doing is pulling one hdd out, unhooking and reconnecting the other HDD. Would like to, just select HDD A or HDD B without swithcing the cabeling. I really do not mind turning on either A or B as needed. Some things I like to save to A and some to B and have convenient switching between them.