INT 13H 03H: Write Sectors
[PC] [XT] [AT]
Expects: AH 03H
AL sector count (see notes)
CH track (cylinder) number (0-n) <Ķ»
CL sector number (1-n) <ĶĶĶĶĶĶĶĶĶĶĶŹĶĶ (see notes)
DL drive: 0-3=diskette; 80H-81H=hard disk
DH head number
ES:BX caller's buffer, containing data to write
0:078 Diskette Parameter Table (for diskette operations)
0:104 Hard Disk Parameter Table (for hard disk operations)
Returns: AH BIOS disk error code if CF is set to CY
Info: This writes the data at ES:BX to the specified sectors.
Notes: ž CX is actually used as a 6-bit and 10-bit field to specify
sector and cylinder. The maximum cylinder number is 1023
but some BIOSes support larger values via translation. See
INT 13H 02H for details.
ž On diskette writes, this function stops a multi-sector write at
the last sector in a track.
ž On hard disks (with XT and AT BIOSes), a multi-sector write
continues on the next higher head of the same cylinder and if
necessary, advances to the next higher cylinder on the first
ž Parameters are the same as for INT 13H 02H (read sectors).
See Also: INT 26H (write absolute sectors)
DOS fn 440dH 41H (IOCTL read track)
INT 13H: BIOS Disk I/O