Lpc2000

I am no expert on this, but I am lead to believe writing file systems
for flash based storage systems is a tricky business if you want to
get maximum life out of your flash. Apparently, you need to try and
ensure that you write and erase sectors evenly, not just write to
whatever space might be free.

As far as I understand, the physics of how flash works means that if you
don't watch how you write to the memory, over a period of time - not
only can you wear out the cells you are writing to, but adjacent ones as
well.

This company:

http://www.hcc-embedded.com/site.php

do a very neat, very small footprint flash file system for various
embedded processors - including ARM IIRC. More than $150, but if what
they say is true (and I  suspect it is) you will hugely increase the
life of your flash cards.

Cheers,

Rob