DOS Fn 440dH CL=40H: IOCTL Set Device Parameters
Compatibility: 3.2+
Expects: AX 440dH
BX drive (0=default, 1=A, 2=B, etc.)
CL 40H
CH 08H (device category: block device)
DS:DX addr of an IoctlDeviceParmsRec containing desired settings
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Returns: AX error code if CF is set to CY
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Info: Sets block device parameters (such as number of cylinders, bytes-
per-track, etc.) for the specified block device.
Notes: ■ Use 440dH 60H to obtain the current settings, then make
changes, then when done, restore the original settings.
See Also: Fn 44H (IOCTL)
Fn 440dH (generic IOCTL for block devices)
Fn 440dH 60H (query device parameters)
Generic IOCTL Data Packets
Device Requests
DOS Functions
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