or dont type full paths in maya in forstplace. heoever if you use browse maya automaticaly make them accurate if tehy are project relative all you need to do is delete the rpoject root out fo them.
Also then theres the super command dirmap wich can be used to internaly say that this drive path shard is now this path, globaly in maya. VERY USEFULL in theese kinds of situations. but dirmap command reference does actualy contain all the info you need
http://localhost:4449/Maya7.0/en\_US/Commands/dirmap.html