DrThunder88
Senior Cook
Microplane is the brand name for both the woodwork and kitchen tools. Rasps are just files designed for shaping wood. I find Microplanes easiest to locate at dedicated woodworking stores like Rockler or Woodcraft.
I'd stay out of the hardware store for a food gaget. Those tools aren't made from stainless steel and are sometimes painted. After a few uses and cleanings you will most definately see some rust.
Pacanis, you'll be more than happy with a regular grating microplane or the one I provided a link with. Were you using the zesting side of the grater? I can cover 2 dishes with Parm in a matter of seconds with mine.