I've been concerned about constant plugging/unplugging of USB pen drive, going back and forth between PC and keyboard. I purchased the following 4 Port USB 2.0 Switching Hub for use with my Tyros 2. With the push of a single button, it toggles up to 4 USB devices between 2 PC's -- or, as in my use, between PC and T2. Works great! Even has LED's to indicate whether devices are "attached" to PC or T2.
Having researched a number of switchable "sharing" hubs, I found this one to be the best quality and value. Check it out.
Two sources:
http://www.usbgear.com/USB20_4port_SHARING_Hub/ http://www.trianglecables.com/522069.html I got mine from triangle cables.
Charles Walker