Each directory entry is 32 bytes in size.

* Earliest version of DOS did not support sub-directories.

Directory Entries
  File Name and extension in 8.3 format unless VFAT or Fat 32

  File attribute byte
    Read-Only - protects against accidental deletion.
    
    Hidden - prevents displaying with the Dir command.
 
    System - marks file as needed by system.  Essentially Read-Only

    Volume - contains the partition's volume label, stored in root dir.

    Directory - indicates name specifies a directory file with special 
      formatting.

    Arhcive - used to incremental back up of files.  
      If file is changed, flag set.

      Backup software checks flag and copies changed file if set.
        Then clears archive flag bit.

    Some flags mutually exclusive, other not.

  Last change date/time stamp. 

  File size

  Id of 1st cluster of data.
 
  * Root directory, on all versions of FAT except FAT32 
      Considered a special data structure.
      Has limited number entries.