Microsoft KB Archive/103624

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Article ID: 103624

Article Last Modified on 10/31/2006


  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.1
  • Microsoft Windows NT Advanced Server 3.1
  • Microsoft Windows NT Workstation 3.5
  • Microsoft Windows NT Server 3.5

This article was previously published under Q103624


In Microsoft Windows NT, when the static Drive Letter in Disk Administrator is changed on the logical drive that Windows NT is presently installed on, you will receive one of the following error messages, or a combination of the messages:

Winlogon.exe-Drive not ready
The drive is not ready for use; its door may be open. Please check drive [C:] and make sure that a disk is inserted and that the drive door is closed.


Winlogin.exe-No Disk
There is no disk in the drive. Please insert a disk into drive [C:]


System Error
Cannot read from drive [C:]


Change the drive letter in Disk Administrator back to it's original logical drive letter assignment.


Assignment of drive letters affects only the way the device drivers assign drive letters to disks attached to the system. It does not remap any existing references to drive letters. Additionally, there may be active system processes that cannot be stopped in order to change the drive letter references.

Static drive letter assignment is useful in the following cases:

  • To snapshot the existing drive letter assignments, so that new disks can be added to the system without changing the drive letter assignments of the existing disks.
  • To assign a particular drive letter to an existing volume. The former case allows the user to add new disks without having to change environment variables, page file location, .INI files, or application initialization data stored in the registry. However, in the second case, the user (who must be an administrator) is responsible for updating all references to the drive.

For more information, query on the following words in the Microsoft Knowledge Base:

virtual and drive

Additional query words: prodnt sticky

Keywords: kbsetup KB103624