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Int 21 Fn 4405 - DOS 2+ - Ioctl - Write To Block Device Control Channel [D]
AX = 4405h
BL = drive number (00h = default, 01h = A:, etc)
CX = number of bytes to write
DS:DX -> data to write
Return: CF clear if successful
AX = number of bytes actually written
CF set on error
AX = error code (01h,05h,06h,0Dh) (see AH=59h)
Note: format of data is driver-specific
See Also: AX=4403h,AX=4404h,INT 2F/AX=122Bh
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