Boot description.

Boot sector must be compiled as a zero start code and must be
converted into a 512 bytes binary file. Extended BPB required.

code segment byte
     assume cs:code,ds:code
start:
       jmp short begin
       nop
db     'MCS'
db     '     '  ; write you name here :) if it possible
@@SectorSize    dw      0
@@ClusterSize   db      0
@@ReservedSec   dw      0
@@FatsCopies    db      0
@@RootSize      dw      0
@@TotalSectors  dw      0
@@MediaByte     db      0
@@FatSize       dw      0
@@TrackSectors  dw      0
@@Heads         dw      0
@@HiddenSectors dd      0
@@BigTotalSects dd      0
@@DiskAddress   db      0
@@WorkHead      db      0
@@ExtendedBPB   db      29h
@@SerialNumber  dd      0
@@DiskLabel     db      11 dup (?)
@@TypeOfFAT     db      'FAT12   '

begin:
     ; startup code
     ;.....
code ends
     ens start

Rename the resulting .BIN file into .BSC file (Boot Sector Code)
Please  send me this .BSC file for including into new versions of
FFORMAT. All copyrights are reserved by authors.