主要IDE通道
MasterDeviceTimingMode = 0x00000010
MasterDeviceTimingModeAllowed = 0x0000001f
SlaveDeviceTimingMode = 0x00000000
SlaveDeviceTimingModeAllowed = 0x00000000
次要IDE通道
主要IDE通道
MasterDeviceTimingMode = 0x00000000
MasterDeviceTimingModeAllowed = 0x00000000
SlaveDeviceTimingMode = 0x00000010
SlaveDeviceTimingModeAllowed = 0x0000001f
http://batabata.no-ip.com/~bata/pc/2000p.html#005
如果照上述網頁手動修改DeviceTimingMode(0x00001010,0x00002010....),
DeviceTimingModeAllowed(0xffffffff), 在重開機後又會回復原始設定值, 因此更改無效.