so i have a 250gb external harddrive that when i tried to install a game to a warning prompt came up saying the performance may suffer. it's advertising the one specifically for 360. i'm just wondering why would the performance suffer? does it really or is it just to get me to buy something else? i only have the 4gb system which seems to make a lot of noise when a game is in the drive, so i'd like to install the to curb that and i really don't want to have to deal with replacing the drive. is there a reason why my external drive apparently won't be up to par with the 8gb flash they are advertising?