Microsoft KB Archive/246150

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Windows 2000 Cannot Access Windows NT 4.0 Disk Array

Article ID: 246150

Article Last Modified on 3/1/2007


  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server
  • Microsoft Windows 2000 Professional Edition
  • Microsoft Windows 2000 Datacenter Server

This article was previously published under Q246150


If you are dual-booting Windows 2000 with Microsoft Windows NT 4.0, you may not be able to access stripe or volume sets that you created in Windows NT 4.0 after you install Windows 2000.


This behavior occurs because Windows 2000 creates stripe and volumes sets using dynamic disk technology. When you install Windows 2000, Setup reads the disk set information that was created by Windows NT 4.0 and copies this information to Windows 2000. This process occurs automatically only during Windows 2000 Setup.


To resolve this issue, restore your disk in Windows 2000 from a current disk configuration backup that was created in Windows NT 4.0 Disk Administrator.

CAUTION: Do not perform this operation if you have created disks or partitions in Windows 2000 that you cannot access from Windows NT 4.0. Doing so may result in a loss of data on the partitions that were created in Windows 2000.

To create saved configuration in Windows NT 4.0:

  1. Log on to the computer as an administrator.
  2. Click Start, point to Programs, point to Administrative Tools, and then click Disk Administrator.
  3. On the Partition menu, click Configuration, and then click Save. Disk Administrator saves the Windows NT 4.0 disk configuration to drive A.

To restore the Windows NT 4.0 disk configuration to Windows 2000:

  1. Log on to the computer as an administrator.
  2. Click Start, point to Settings, click Control Panel, double-click Administrative Tools, and then click Computer Management.
  3. If it is not already expanded, expand the Storage branch, and then click the Disk Management folder to open it.
  4. On the Action menu, click Restore Basic Disk Configuration.

NOTE: Depending on the current Windows 2000 configuration, you may have to reboot your computer twice to gain access to the stripe or volume sets.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Additional query words: fault tolerant unformatted inaccessible

Keywords: kbconversion kbdynamic kbfilesystems kbprb KB246150