Int 2F/AX=1509h

AX = 1509h
ES:BX -> buffer
CX = drive number (0=A:)
SI:DI = starting sector number
DX = number of sectors to write

Note: Corresponds to INT 26h and is currently reserved and nonfunctional, but could be implemented for CD-R and CD-RW drives

See Also: AX=1508h