Article ID: 305176 - Last Review: February 19, 2007 - Revision: 3.3 Hotfix to Add DMA Support for IDE Tape UnitsThis 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.
RESOLUTIONTo 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
(http://support.microsoft.com/kb/260910/EN-US/
)
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 STATUSThis 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
(http://support.microsoft.com/kb/265173/EN-US/
)
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
(http://support.microsoft.com/kb/296861/EN-US/
)
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
(http://support.microsoft.com/kb/249149/EN-US/
)
Installing Microsoft Windows 2000 and Windows 2000 Hotfixes
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