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32 lines
1.1 KiB
Markdown
32 lines
1.1 KiB
Markdown
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---
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title: HD uses PIO instead of DMA
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layout: default
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created: 2008-07-15 00:10:30 +0200
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updated: 2009-02-19 22:06:02 +0100
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toc: false
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tags:
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- know-how
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- software
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- windows
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- hardware
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- hdd
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---
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If Windows uses PIO mode instead of DMA, it probably have slowed down due to reading errors. To fix the slow-down, find
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the registry key:
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HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96A-E325-11CE-BFC1-08002BE10318}
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This contains the subfolders `0000`, `0001` and `0002`. `0001` is the primary IDE port and `0002` is the secondary. But
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watch the entries in there and you'll get the idea.
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The important values are `MasterIdDataChecksum` and `MasterDeviceTimingModeAllowed` as well as `SlaveIdDataChecksum`
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and `SlaveDeviceTimingModeAllowed`. Delete the keys and reboot. Windows will re-detect the speed and should be back at
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full DMA speed.
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Usually, this should be fixed since SP2, but it seems to not work everywhere. You could try to force a retry by adding
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a DWORD-entry `ResetErrorCounterOnSuccess` with a value of `1` to that key.
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*[PIO]: Programmed Input/Output
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*[DMA]: Direct Memory Access
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