This article was previously published under Q314695
This article has been archived. It is offered "as is" and will no longer be updated.
IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:
256986 Description of the Microsoft Windows Registry
Using 48-bit Logical Block Addressing (LBA) support (per ATA/ATAPI-6) permits hard disks to be larger than 137 gigabytes (GB) in size. When 48-bit LBA support is turned on for ATA Packet Interface (ATAPI) drives in a RAID 1 (mirroring) configuration, performance is noticeably reduced.
Note that if you install the update that is described in this article, you must add a registry value to turn on the LBA support. See the "More Information" section in this article for more information.
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 theMicrosoft 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 ---------------------------------------------------- 17-Dec-2001 13:09 5.0.2195.4776 86,704 Atapi.sys
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 3.
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
Follow these steps:
Locate and then click the following key in the registry:
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