Syntax: format [driveletter:] [/q] [/fs:filesystem] [/v:label][/x]
Explanation: [driveletter:] is the drive letter for the disk or hard drive volume that you want to format.
[/q] is the parameter used if you want to perform a quick format.
[/fs:filesystem] is the parameter used if you want to specify a file system. Valid values are FAT, FAT32, exFAT, and NTFS.
[/v:label] The /v: must be part of the command, followed by the name of the volume assigned.
[/x] dismounts the volume first, if necessary.
Example: format c: /fs:ntfs
Notes: If no /fs:filesystem parameter is specified, the NTFS file system is used. FAT is FAT16. FAT16 hard drive volumes cannot be more than 4 GB in size.