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    Server Migration Center:What do I do if the drive letters of data disks are missing or invalid during instance startup after I migrate a Windows server?

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    Server Migration Center:What do I do if the drive letters of data disks are missing or invalid during instance startup after I migrate a Windows server?

    Last Updated:Mar 04, 2024

    This topic describes the issue that the drive letters of data disks are missing or invalid during instance startup after you migrate a Windows server by using Server Migration Center (SMC). This topic also describes the causes of and solutions to this issue.

    Problem description

    The drive letters of data disks are missing or invalid during instance startup after you migrate a Windows server.

    Cause

    The operating system cannot recognize the disks because the disk driver is faulty or missing. Therefore, the drive letters of the data disks are missing or invalid.

    Solution

    • If the drive letter of a data disk is missing, you can add the drive letter in the Disk Management utility.

      1. Go to Control Panel. Choose System and Security > Administrative Tools > Computer Management.

      2. In the Disk Management utility, right-click the data disk whose drive letter is missing, and click Change Drive Letter and Paths.

      3. Click Add and specify a drive letter.

    • If the drive letter of a data disk is invalid, you can change the drive letter in the Disk Management utility.

      1. Go to Control Panel. Choose System and Security > Administrative Tools > Computer Management.

      2. In the Disk Management utility, right-click the data disk whose drive letter is invalid, and click Change Drive Letter and Paths.

      3. Click Change and change the drive letter of the data disk.