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Disk defragmenter and PIO mode

Discussion in 'Windows XP' started by jexposit, 2004/01/21.

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  1. 2004/01/21
    jexposit

    jexposit Inactive Thread Starter

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    First of all, I'm new in this forum and want to apologize for my english. I'm form Spain and I speak spanish better :) .

    Well the question....

    does anybody know why when I run the disk defragmenter my HD changes from Ultra DMA 5 to PIO mode?

    Thanks in advance.

    Juan_Miguel Exposito_Lopez
    Almeria
    Spain
     
    jexposit,
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  2. 2004/01/21
    Christer

    Christer Geek Member Staff

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    Hi Juan!

    This is the way I understand how:

    When transferring data, a "check sum" is tagged to each packet. The system checks this to make sure that what was "sent" is what "arrives ".
    If the "check sum" isn´t the same, then WinXP will reduce the transfer rate until there are no more errors.

    Defragmenting involves a lot of "sending ", "arriving" and "checking" but I don´t know why it happens in Your case.

    Christer
     
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  4. 2004/01/21
    jexposit

    jexposit Inactive Thread Starter

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    Hi Christer !!


    Thanks you for your answer....

    Perhaps it happens because I try to check the transfer mode while the defragmenter is running...... who knows...

    I'll try do nothing while the degragmenter is running....

    Thanks again.

    JuanMi
     
    jexposit,
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  5. 2004/01/21
    jexposit

    jexposit Inactive Thread Starter

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    I have found this:

    "Note in WinXP if a DMA device (HDD/CD-ROM) makes more than 6 transfer timeouts then it is degraded to PIO mode (Independent of lifetime). The only way to reenable DMA is to remove the device or controller in the Device Manager (It will redetect the device automaticly). "

    JM
     
    jexposit,
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  6. 2004/01/21
    Christer

    Christer Geek Member Staff

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    Yes, I have seen that too but I understood it as Your HDD being reduced to PIO mode only temporary, when running the defragmenter.

    It is possible that it has something to do with You accessing the Task Manager at the same time. Personally, I wouldn´t have anything else running in the back ground during defragmentation.

    Christer
     
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  7. 2004/01/21
    Newt

    Newt Inactive

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    Try booting to safe mode and then running the defrag. Slightly slower but does a better job I think.
     
    Newt,
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