> A filesystem is not necessary but it surely will make things simpler

That's true. All very well when you start off with a clean card but as
files are replaced, added or deleted you need something to track the
useage

> Your code will check if 0xBAE000 is occupied or not, give it a try

Sure, the first draft is a little simpler than it should be, but it did 
work,
so that's something to build on. I've added quite a few more lines in
the last couple of hours to eliminate static values, begin covering the
"what ifs" etc

Joe 

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