Windows 8 and 8.1 Forums


IDE UDMA Registry Options in Windows 8 still?

  1. #1


    Posts : 9
    Windows 8.1

    IDE UDMA Registry Options in Windows 8 still?


    Hello,

    The first question I can imagine you are thinking is what am I talking about or why? : )

    For a project I am working on we are using Windows 8.1 with SATA configuration in IDE. Not AHCI.


    A few years ago you use to be able to go to the following Hard Disk Controller ClassGuid

    registry:


    HKLM\System\CCS\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}


    And set the UDMA mode by adding the following DWORDS in the registry:


    MasterDeviceTimingModeAllowed 0xFFFFFFFF
    SlaveDeviceTimingModeAllowed 0xFFFFFFFF
    UserMasterDeviceTimingModeAllowed 0xFFFFFFFF
    UserSlaveDeviceTimingModeAllowed 0xFFFFFFFF
    MasterDeviceTimingMode 0xFFFF
    SlaveDeviceTimingMode 0xFFFF

    Where 0xFFFFFFF could be changed to the following to set the IDE UDMA speed:


    for Ultra ATA33 (33.3MB/s) - 0x2010
    for Ultra ATA66 (66.7 MB/s)- 0x8010
    for Ultra ATA100 (100MB/s) - 0x10010
    for Ultra ATA133 (133 Mb/s) - 0x12010


    Where some of the different UDMA modes are shown here:
    Mode 0
    16.7
    MB/s
    Mode 1
    25.0
    MB/s
    Mode 2
    33.3
    MB/s
    Mode 3
    44.4
    MB/s
    Mode 4
    66.7
    MB/s
    Mode 5
    100.0
    MB/s

    The registry:


    HKLM\System\CCS\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}


    and all the proper sub registries still exists in Windows 8/8.1 but I cannot get Windows 8 to change from UDMA Mode 5.



    Anybody?

      My System SpecsSystem Spec

  2. #2


    Posts : 9
    Windows 8.1


    I have since found out the above commands only work with the out of date Intel Application Accelerator. This no longer works with Windows 8.

    Does anyone know a registry hack to lower the UDMA setting in Windows 8?
      My System SpecsSystem Spec

  3. #3


    Use an old 40 wire data cable, it will drop to UDMA 33 all by itself (BIOS might complain though).
      My System SpecsSystem Spec

  4. #4


    Posts : 9
    Windows 8.1


    Quote Originally Posted by CountMike View Post
    Use an old 40 wire data cable, it will drop to UDMA 33 all by itself (BIOS might complain though).
    Hi Mike,

    Thanks for the response but I am using drives with SATA connectors, not IDE.
      My System SpecsSystem Spec

IDE UDMA Registry Options in Windows 8 still?
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