Notice: This website is an unofficial Microsoft Knowledge Base (hereinafter KB) archive and is intended to provide a reliable access to deleted content from Microsoft KB. All KB articles are owned by Microsoft Corporation. Read full disclaimer for more details.

Windows Server 2008 installation fails with "The computer could not find a valid system volume" when installing to previously used disks

View products that this article applies to.


When attempting to install Server 2008 to a disk which was formerly used in a ZFS pool, you may receive the following error message:

 "The computer could not find a valid system volume"


When using Diskpart with the clean or clean all command from within Windows to erase any existing partitions on a disk which was formerly used in a ZFS pool before creating Windows compatible partitions you may receive the following error message:

"The system's information about the object may not be up to date."


 When in the Disk Management MMC console, if you try to online a disk which was formerly used in a ZFS pool, you get the error message:

"The disk structure is corrupted and unreadable."


↑ Back to the top


The EFI partition header size is 200H on disks using the ZFS filesystem.  In Server 2008, we check for an EFI partition header size of 5CH when examining disks. Since the header size does not match our value, we decide that the disk is corrupt. This leads to a situation where the ZFS disks cannot be onlined, and cannot be cleaned or repartitioned using diskpart directly.

↑ Back to the top



With the problem disk attached to a running Windows Server 2008, complete the following commands.

Note: For information on connecting the problem disk consult your hardware or storage provider.

 1. From a command prompt with administrative rights:
    Run diskpart
      Issue the following commands:
      SAN POLICY=OnlineAll

2. Open Device Manager.
    Under Disk Drives, right click each disk (that has the problem) and choose uninstall

3. Open Disk Management
    Choose Rescan from the Action menu
    Initialize each disk

4. The disks should now be useable; partition and format as desired.

Note: The EFI partition information on the disk is not able to be reset from within Setup.


↑ Back to the top

Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

↑ Back to the top

Keywords: KB2000301

↑ Back to the top

Article Info
Article ID : 2000301
Revision : 7
Created on : 1/22/2010
Published on : 1/22/2010
Exists online : False
Views : 115