The Windows 2000 Setup program does not enumerate hard disks correctly when both SATA and PATA drives are installed on a computer

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Consider the following scenario: You have both Serial Advanced Technology Attachment (SATA) hard disks and Parallel Advanced Technology Attachment (PATA) hard disks installed, and you create a system partition on the SATA hard disk. You assign the drive letter C to that partition, and then you install Microsoft Windows 2000 on the computer. In this scenario, the Windows 2000 Setup program may ignore the active partition on the SATA hard disk, and the PATA hard disk may receive the drive letter C.
This problem occurs when all the following conditions are true:
  • The SATA hard disk is configured as Disk1, and the basic input/output system (BIOS) has set the disk to be the primary (C) hard disk.
  • The PATA hard disk is configured as Disk0 and is set to be the secondary (D) hard disk.
Although the BIOS recognizes this configuration correctly, the Setup program assigns the drive letter C to Disk0 (the PATA drive) during the hard disk enumeration phase of the Setup program. This behavior occurs because the Setup program recognizes the first hard disk (Disk0) at system startup and then queries all partitions on Disk0 for a system partition. If the Setup program finds a system partition, it assigns the drive letter C to the partition. If the Setup program does not find a system partition, it queries all partitions to find a primary partition. If a primary partition is found, the Setup program assigns the next drive letter to the partition. (If this is the first partition found, the Setup program assigns the drive letter C.) Then the Setup program proceeds to the next hard disk (Disk1). In this scenario, Disk0 always receives the drive letter C if there is a system partition or a primary partition present, even if the primary partition is not a system partition.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


No prerequisites are required.

Restart requirement

You must restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
   Date         Time   Version        Size       File name   ----------------------------------------------------------   21-Oct-2003  22:26  5.0.2195.6867    111,488  Hal98tmr.dll   21-Sep-2003  01:36  5.0.2195.6824     29,712  Mountmgr.sys   21-Oct-2003  21:24  5.0.2195.6867  1,699,008  Ntkrnlmp.exe   21-Oct-2003  21:24  5.0.2195.6867  1,698,432  Ntkrnlpa.exe   21-Oct-2003  21:24  5.0.2195.6867  1,719,168  Ntkrpamp.exe   21-Oct-2003  21:24  5.0.2195.6867  1,676,672  Ntoskrnl.exe
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
More information
For additional information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
816915 New file naming schema for Microsoft Windows software update packages
824684 Description of the standard terminology that is used to describe Microsoft software updates

Article ID: 830656 - Last Review: 01/17/2015 16:16:19 - Revision: 4.0

Microsoft Windows 2000 Server, Microsoft Windows 2000 Professional Edition, Microsoft Windows 2000 Advanced Server

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