Haha, I spent so much time debugging their crappy FAT-driver. Another time the whole system would just hang when you created a new file in a directory that already contained some files. Turns out that their long-to-short filename algo was:

For the first 4 files with identical prefix use the ~N scheme as in LongFile.txt -> LONGFI~1.TXT For the following files it was: 1) "LONG" + hex_str(hash(long_file_name)) + ".TXT" 2) if there's a name collision repeat step 1.

Compound that with a the fact that hash() was implemented something like:

    int h = 0;
    for(int i = 0; i < strlen(long_file_name); ++i)
    {
      h = (h + long_file_name[i]) ^ 0x42424242;
    }

It's pretty easy to see where this falls apart...