I've just bought Super Mario All Stars today and backup my copy to my USB loader (WD Mybook 1.5TB)

It plays fine and all but...

For some reason, whenever my hard drive light blinks (or other words, processes the the game in the hard drive) while I tap lightly on right on the d-pad to give Mario a little nudge forward. The game thinks that I'm holding right and makes Mario walk instead nudge. Causing me to either run into a enemy or fall into a hole bothing killing myself.

As you may know, the mario 2d games need extra pixel perfect percision to clear jumps and all.

Is there a way to get the controls to work smoothly while playing on a hard drive?