so i have 3 xboxs. one for work. one for the living room at home and one for the bedroom. i only have 1 harddrive. would a 64mb memory card be enough to hold my gamertag so i can just stick that in the xbox when i want to use the xbox's without a harddrive? i know i can just take off the harddrive and take it with me but a memory card is smaller and i found a 64mb MC for 5 bucks. i only want to stream movies usually. will this work?