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Help! with DMA Bus Mastering

Discussion in 'Hardware' started by looper, Jan 13, 2003.

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  1. looper

    looper Thread Starter

    Dec 20, 2002
    Hi there;

    this is my first post to the site. It's early in the morning and I'm tired, but I'll try to make this lucid. :)

    I found some web pages describing how to bus master a hard drive. I primarily used the following link to bus master my hard drive, as the instructions seemed pretty comprehensive:


    First I tested my hard drive for "multiple-word DMA protocol" compatibility via the command prompt. Then I check-marked the option in the Properties window of the hard drive (in Device Manager) and rebooted. The check-mark is still there. So far, so good. The next step, however, I am hesitant to perform, for several reasons.

    1. None of the other web sites that described this tweak included this step (which is: editing Mshdc.inf, removing the IDE devices from the Device Manager window, and rebooting).

    2. I'm not sure what the 2 lines added to Mshdc.inf do, and as I only enabled DMA on my hard drive, and not on any other drive, I don't know if I should add both lines.

    Here is the section of Mshdc.inf that would be edited, with the two lines (in bold) added at the end:

    HKR,,DriverDesc,,"ESDI Port Driver"

    3. I don't know which of my drives are IDE devices, whether controllers are considered devices or not, and whether I should remove other IDE drives from the Device Manager, or just the hard drive. As far as I can see, there are six possibilities for "IDE devices" that I should remove: the floppy disk, the hard disk, the CD Rom, the dual IDE controller, the primary IDE controller, and the secondary IDE controller.

    I've attached a snapshot of my Device Manager window, with all the pertinent devices apparent.

    What should I do? Is any of this necessary?

    Thanks in advance for any help you can give me!
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