FORMAT

Formats a disk for use with MS-DOS.

The FORMAT command creates a new root directory and file 
allocation table for the disk. It can also check for bad areas 
on the disk, and it can delete all data on the disk. In order 
for MS-DOS to be able to use a new disk, you must first use this 
command to format the disk.

For more information, please refer to MS-DOS Help or Windows NT 
command line command help.