Windows XP: Checking and Installing DMA (Windows XP)

To see which DMA mode your drives are in, you need to open the Control Panel -> System -> Hardware -> Device Manager and view the properties of the ATA / ATAPI IDE controllers. Double click on the IDE ATA / ATAPI controllers to open their list, right-click on the Primary IDE Channel and Secondary IDE Channel entries and open the Properties item in the menu that appears



Next you need to select the Additional settings tab, you will see the current transmission modes. In order to change the values, you need to select the desired parameter in the drop-down menu.

Note: DMA mode is optimal, but some CD-ROMs do not work correctly in DMA mode, so if you find that your CD-ROM is using PIO mode, you can try to enable DMA mode, however, if it starts to work incorrectly Return it to PIO mode.



If you want to know which device (hard disk or CD-ROM drive) is using which channel, you can go to the View tab in the Task Manager and select the Device by connection option.



Also you can look at which physical disk is which part of the disk, for this you need to right-click on the disk whose properties you go to see, select Properties -> Volumes and click the Fill button.



UDMA66

According to Microsoft Corporation, UDMA66 mode is disabled for a while in computers built on the basis of Intel chipsets supporting UDMA66. In order to enable UDMA66 mode, you need to perform the following operations:

• Make sure your device supports
• Use an 80-wire loop to connect this unit
• Add the following key to the registry
Add the following key:

1. Start the Registry Editor (Start -> Run, type regedit)
2. Find the branch HKEY_LOCAL_MACHINE \ System \ CurrentControlSet \ Control \ Class \ {4D36E96A-E325-11CE-BFC1-08002BE10318} \ 0000 \
3. Right-click on an empty spot on the right side of the screen and select New -> DWORD parameter
4. Name the new value EnableUDMA66
5. Double click on this new value and enter 1 in the Value line.
6. Close the Registry Editor
7. Restart Windows for the changes to take effect.

After Windows restarts, UDMA66 mode will be enabled if it is supported by your computer.