F2 - Backup the Master Boot Record - prompts for a path and filename to save the MBR binary image.
F3 - Restore Master Boot Record
F4 - Backup the Boot Sector - prompts for a path and filename to save the Boot Sector.
F5 - Restore Boot Sector
F6 - Disable FT on the Boot Drive - useful when Windows NT will not boot from a mirrored system drive. The function looks for the bootable (marked active) partition. It then checks to see if the SystemType byte has the high bit set. Windows NT sets the high bit of the SystemType byte if the partition is a member of a Fault Tolerant set. Disabling this bit has the same effect as breaking the mirror.