通常會在這個目錄下：
[HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Control\Class\
再使用搜尋：『primary』或『secondary』


機碼可能形式
＝＝＝＝＝＝＝＝＝＝＝
"EnumPropPages32"="storprop.dll,IdePropPageProvider"
"InfPath"="mshdc.inf"
"InfSection"="atapi_Inst_primary"
"ProviderName"="Microsoft"
"DriverDateData"=hex:00,80,62,c5,c0,01,c1,01
"DriverDate"="7-1-2001"
"DriverVersion"="5.1.2600.1106"
"MatchingDeviceId"="primary_ide_channel"
"DriverDesc"="主要 IDE 通道"
"MasterDeviceType"=dword:00000001
"SlaveDeviceType"=dword:00000001
這裡就是傳輸模式 →DNA5 "MasterDeviceTimingMode"=dword:00010010
"MasterDeviceTimingModeAllowed"=dword:ffffffff
"MasterIdDataCheckSum"=dword:00019a02
"SlaveDeviceTimingMode"=dword:00010010
這裡也一併要改 "SlaveDeviceTimingModeAllowed"=dword:ffffffff
"SlaveIdDataCheckSum"=dword:00016e02