INT 13h,  06h (6)        Format Track and Set Bad Sector Flags     fixed disk
 
    Initializes each sector on a specified cylinder with sector address
    and size information; also marks the sectors on the track as unusable
    (bad) by setting the bad sector flag in the ID fields. Only XTs may
    use this service.
 
       On entry:      AH         06h
                      AL         Interleave value
                      CH         Cylinder number (10-bit value; upper 2 bits
                                 in CL)
                      DH         Head number
                      DL         Drive number (Bit 7 must be set)
 
       Returns:       AH         Status of operation (See Service 01h)
                      CF         Set if error, cleared otherwise
 
  --------------------------------------------------------------------------
 
       Notes:         This service will destroy all previous contents of
                      the disk.
 
                      The cylinder number is a ten-bit quantity (0 through
                      1023). Its most significant two bits are in bits 7
                      and 6 of CL; the remaining eight bits are in CH.
 
                      If an error is encountered, use Service 0h to reset
                      the drive and retry the operation.

Seealso:


 INT 13h, 01h 
 INT 13h, 05h 
 INT 13h, 07h