Microsoft KB Archive/830573

= Online hard disks disappear after you use Device Manager to scan for hardware changes in Windows Server 2003 =

PSS ID Number: 830573

Article Last Modified on 2/10/2004

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The information in this article applies to:


 * Microsoft Windows Server 2003, 64-Bit Datacenter Edition
 * Microsoft Windows Server 2003, 64-Bit Enterprise Edition
 * Microsoft Windows Server 2003, Datacenter Edition
 * Microsoft Windows Server 2003, Enterprise Edition
 * Microsoft Windows Server 2003, Standard Edition
 * Microsoft Windows Server 2003, Web Edition

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SYMPTOMS
If you use Device Manager to scan for hardware changes, online hard disks disappear from Device Manager. For example, the hard disk that has the logical unit number (LUN) identifier &quot;LUN 1&quot; disappears.

Note Online hard disks appear in Disk Management and display the &quot;Online&quot; status.



CAUSE
This behavior occurs if a small computer system interface (SCSI) hard disk that has the &quot;LUN 0&quot; identifier is offline when you run the Device Manager hardware scan. If the hardware scan fails when it tries to scan &quot;LUN 0&quot; in a particular target, the operating system marks all the devices with LUNs in that target as missing. Subsequently, Plug and Play uses a Device Relations query to remove the hard disks that share the same target ID as &quot;LUN 0&quot;.



MORE INFORMATION
This behavior is according to the SCSI specification.

Additional query words: LUN

Keywords: kbprb KB830573

Technology: kbWinServ2003Data kbWinServ2003Data64bit kbWinServ2003Data64bitSearch kbWinServ2003DataSearch kbWinServ2003Ent kbWinServ2003Ent64bit kbWinServ2003Ent64bitSearch kbWinServ2003EntSearch kbWinServ2003Search kbWinServ2003St kbWinServ2003Web

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