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.

See also: INT 13h, 01h
See also: INT 13h, 05h
See also: INT 13h, 07h

INT 13h, 06h (6) Format Track and Set Bad Sector Flags fixed disk