>I'm looking at the contents of the sectors >of an SD card formatted FAT16. The definitive document is the Microsoft one, which includes pseudo C code on how to deal with every item. Search the MS website for fatgen103.pdf (the number might be greater, as that is the revision number) and all will become clearer. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist