I need to write a win9x app that locate and read the FAT32 of a big disk (eg:80GB). My main goal is to locate the entire cluster chain for a given filename. I know that there are Int13 extensions and Int 21 ax=730x functions, but I don?t know which ones or how I must use them. I understand basic Vxd programming if is needed. Direct help or good links are welcome. Thanks!