FIXBOOT
fixboot drive name:
Use this command (where drive name is the drive letter where the boot sector will be written) to write the new Windows boot sector code on the boot partition. This command fixes problems where the Windows boot sector is corrupted. The Emergency Repair process also fixes the boot sector. This command overrides the default of writing to the system boot partition.

FIXMBR
fixmbr device name
Use this command (where device name is an optional device name that specifies the device that needs a new MBR) to repair the master boot record (MBR) of the system partition. This command is used in scenarios where a virus has damaged the MBR and Windows cannot start.

WARNING: This command has the potential to damage your partition tables if a virus is present or a hardware problem exists. This command may lead to inaccessible partitions. Microsoft suggests running antivirus software before using this command.

The name can be obtained from the output of the map command. If this is left blank, the boot device's MBR is fixed, for example:
fixmbr \device\harddisk2
If Fixmbr detects an invalid or non-standard partition table signature, it prompts you for permission before rewriting the MBR.
FORMAT
format drive: /Q /FS:file-system
Use this command (where /Q performs a quick format of the drive, drive is the drive letter of the partition to format /FS:file-system specifies the type of file system to use [FAT, FAT32, or NTFS]) to format the specified drive to the specified file system.

If a file system is not specified, the existing file system format is used, when available.