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Orjinalden alıntı: Twister

Bir akrabamızda da aynı model notebook ve aynı sorundan vardı. Aygıt yöneticisinden transfer moduna baktığımda PIO olduğunu farkettim. Ancak dma if available seçmeme rağmen DMA olmuyordu. Nette araştırdıktan sonra bir yazı buldum ve onu uyguladım, şimdi Ultra DMA olarak çalışıyor. Sorun düzeldi mi haber almadım henüz ama siz de bir deneyin, sorununuz çözülebilir:

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Re-enable DMA using the Registry Editor
My thanks go to my fellow MVP Alexander Grigoriev who taught me this method.

Run REGEDIT. Go to the following key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}

It has subkeys like 0000, 0001, 0002, etc. Normally 0001 is the primary IDE channel, 0002 the secondary, but other numbers can occur under certain circumstances. You have to go through these subkeys and check the DriverDesc value until you find the proper IDE channel.

Delete MasterIdDataChecksum or SlaveIdDataChecksum, depending on whether the device in question is attached as master or slave, but it can't actually hurt to delete both. Reboot. The drive DMA capabilities will be redetected.

Open Device Manager again and check whether the device is now actually using DMA mode. If so, congratulations, you've made it (at least until the next time Windows disables DMA).

2005-10-24 – Tomáš Souček wrote, if this doesn't work, check also the dword value MasterDeviceTimingModeAllowed, whose default value is hex 0xFFFFFFFF. If you have a much smaller value, you can try to set it back to its default and reboot for a test.

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Yazının kaynağı:http://www.michna.com/kb/WxDMA.htm