Microsoft KB Archive/305176

= Hotfix to Add DMA Support for IDE Tape Units =

Article ID: 305176

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2

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This article was previously published under Q305176



SYMPTOMS
The Microsoft IDE controller driver always selects PIO for tape drives, and this behavior cannot be changed by a user or a program.



RESOLUTION
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

The English version of this fix should have the following file attributes or later:

  Date         Time   Version      Size    File name --  21-Feb-2002  10:45  5.0.2195.49  86,704  Atapi.sys



STATUS
This behavior is by design. This problem was first corrected in Windows 2000 Service Pack 3.



MORE INFORMATION
PIO requires the host (computer) to coordinate every input/output transaction. With DMA, devices can communicate directly to each other by using the controller, and this process requires less overhead than PIO. You can overcome this design limitation by applying the hotfix that is described in this article.

For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:

249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Additional query words: kbBaseOS polled io

Keywords: kbbug kbfix kbqfe kbwin2000sp3fix kbenv kboswin2000fix kbwinxpsp1fix kbhotfixserver KB305176

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