Microsoft KB Archive/246799

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Missing a Drive That Was Part of a Volume Set After Running a Repair Process

Article ID: 246799

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q246799


After you run a repair process on a Microsoft Windows NT Server 4.0-based computer that is configured with a volume set, one of the drives may not appear in Windows Explorer. Also, Disk Administrator may show the drive with or without an assigned drive letter and may list it as Unknown.

All configurations that use fault tolerance with either file allocation table (FAT) or NTFS file system volumes may exhibit these symptoms.


This behavior can occur when you use repair information from your hard disk drive instead of from an updated Emergency Repair Disk, and the information on the hard drive does not include the latest fault tolerance configuration.


To resolve this issue, please refer to the instructions in the following articles in the Microsoft Knowledge Base:

131658 Use Ftedit.exe to Recover Fault Tolerant Disk Configuration.

149927 Ftedit.exe: What You Can and Can't Use It For


When you run the Rdisk utility and choose the Update Repair Info option, the system writes up-to-date information to the %SystemRoot%\Repair folder on the hard disk drive, and then it prompts you to update or create the ERD. If you choose Create Repair Disk, the system does not update the repair information before copying it directly to the ERD.

It is also important to make sure that Ftdisk is set to a start value of Boot and that it is started. Ftdisk is the device driver that handles input and output for volume sets, stripe sets, mirror sets, and stripe sets with parity. If the drive still appears as Unknown in Disk Administrator after you restore disk information, use the Devices tool in Control Panel to check the start value of Ftdisk.

Additional query words: Emergency damage

Keywords: kbprb KB246799