The answer is the
delete command
When a file is deleted with the MS-DOS
delete command, the hex e5 (0xe5) value tells the OS that the file is
unavailable and a new file is ready to be written to the same cluster position.
In a FAT file system, when you delete a file, the hex e5 character replaces the
1st letter of the filename and the file of that FAT chain is set to
0
