Oh, and for what it's worth, I just ordered some FRAM chips from Mouser. That should speed up sector reading a bit. I got 64K's so I can have up to 16 sectors or 4 clusters in RAM at one time. Since it will be so fast (up to 1mhz), I might use it to hold other data too. Having bigger and faster memory is like buying a Ford Excursion after owning a VW Rabbit.