help getting Super Robot Taisen (U) to run on my DSTT

okay, so I got rom 3728 today and tried running it on my DSTT.
It creates a sav but near the end of loading, a message pops up saying:[Rom loading failed]
Disk errcode=-81Please reset system.I think I should format my card but that would take time and I'm not sure it would work 100%.Oh and if this is the wrong place to post could anyone move to the right place? Thanks in advance. ;D

Nevermind...I got it to work via formatting.

i have the same error whats this via formate? please do explain.. thnx