Emu XL-7 & MP-7 User's Group

I was editing a preset and got so familiar with saving patterns and 
preset that I sometimes anticipate the motion.  It was probably my 
slight of hand that when I saved a preset I received a "saving 
error!!!" on the display.  The second line read "Making backup..."  
and the next display read "compacting free space..."  At this point 
I completely froze.  I let it do its thing until finished.  It took 
well over 3 minutes.  I checked my preset and eveything was cool and 
didn't even require a reboot.  Any idea what happened?