Current DMA UsageThis value indicates whether DMA is currently being used for each channel. There are 3 possible values:
- DMA In Use indicates that DMA transfers are being used on this channel.
- DMA Not In Use indicates that DMA transfers are not being used on this channel and that the IDE/ATAPI driver is defaulting to Programmed I/O (PIO) transfer methods.
- No IDE/ATAPI Devices Detected indicates that the utility could not read the status of that channel from the registry, either because there was no IDE/ATAPI device present or because the current user has insufficient privileges to access the registry. These settings cannot be changed and are dependent on the DMA support provided by your hardware and the value of the DMA detection settings.
DMA Detection StatusThis setting indicates whether the ATAPI driver will attempt to detect and use DMA support on a given channel.
If DMA detection is disabled on a channel, the ATAPI driver defaults to PIO transfers on that channel. If DMA detection is enabled on a channel, the ATAPI driver queries the hardware for DMA support and if it is detected uses DMA for data transfers.
If the hardware does not correctly support DMA transfers, PIO is used even if DMA detection is enabled.
When the utility initially starts, radio buttons indicate the current settings for each channel. To change the detection status, click the preferred setting and it is saved when you exit DMACheck.
How to Obtain DMACheckYou can obtain DMACheck from the following folders on the Windows NT 4.0 Service Pack 3 compact disc:
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
Article ID: 191774 - Last Review: Oct 26, 2013 - Revision: 1