No as far as i know it's not, and even if it where it would probably be a bad idea.
Just install it to your local HD. The only reason i could see for running it of an external drive is to swap the copy of Maya about amongst several machines which violates the license and also wont work.
Worst Response To A Crisis:
From a readers' Q and A column in TV GUIDE: "If we get involved in a nuclear war, would the electromagnetic pulses from exploding bombs damage my videotapes?"