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When you use a hardware snapshot provider to take volume snapshots, a snapshot failure may leave volumes with the read-only and hidden attribute bits set. This configuration may leave volumes in an unusable state, even after you restart the computer. As a result, you may experience one of the following symptoms:

  • When you try to write to the affected volumes, you receive the following error message:

    Media is write protected

  • When you attempt to create a new volume mount point for the affected volume in disk management or in the Diskpart.exe utility, you receive one of the following error messages:

    The path cannot be used for creating a drive path likely because the folder does not exist or is already a drive path to some other volume.

    The path can not be used for creating a drive path. Probable reasons are that the directory is not present or the directory is already a drive path to some other volume.

    DiskPart could not assign the drive letter or mount point. Make sure the drive letter or mount point is valid.

  • A cluster disk resource will not come online and an error 258 will appear in the cluster log file.


A hardware problem or an OEM third-party filter driver can interfere with the volume shadow snapshot process. In this case, the read-only, hidden, and Nodefaultdriveletter volume attribute bits may remain set on the original volume that you were taking a snapshot of.


This hotfix will not prevent future snapshot failures or automatically repair volumes that have had the read-only or hidden attributes set. This hotfix contains only a new version of the Diskpart.exe utility. This utility includes a new ATTRIBUTES command that lets you set or reset volume flags that are associated with shadow copy snapshots. The new ATTRIBUTES command will let you reset the flags on the affected volumes so they can be mounted and made available again.

Important If the affected disks are part of a cluster resource, in order to gain access to the physical disks to reset the flags you must shutdown all nodes except one cluster node. On the remaining node, disable the clusdisk.sys driver and restart the node. This will give you access to all the physical disks in the operating system without starting the cluster and this will let you use diskpart.exe to reset the volume flags.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


No prerequisites are required.

Restart requirement

You do not have to restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel. Date Time Version Size File name
20-Apr-2004 06:20 5.2.3790.163 167,424 Diskpart.exe
19-Apr-2004 22:15 5.2.3790.163 46,592 Ws03res.dll


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.


There is no workaround to reset the volume attribute bits if they are not reset after you restart the computer.

More Information

Syntax for the ATTRIBUTES command that is included in the Diskpart.exe utility

Note For master boot record (MBR) basic disks, the attribute bits are applied or changed disk-wide and affect all volumes on the disk. For GUID partition table (GPT) basic disks, the attribute bits are applied or changed per volume. For dynamic GPT or MBR disks, the attribute bits are applied or changed per volume. The Logical Disk Manager (LDM) service checks the volume that is selected in the Diskpart.exe utility to see if the volume is a boot, system, page, crash dump, or hibernate volume. The LDM service does not set the attribute bits if the selected volume is one of those types, and the Diskpart.exe utility displays an error message.


Sample commands

You can use set and clear in one command. The attributes volume command can be abbreviated as the att vol command as follows:

Diskpart> attributes volume set readonly clear hidden
Diskpart> att vol set hidden
Diskpart> att vol clear readonly
Diskpart> att vol set readonly clear hidden

The possible return messages after each command finishes are:

Diskpart failed to set volume attributes.
Volume attributes set successfully.

Diskpart failed to clear volume attributes.
Volume attributes cleared successfully.

After you select the volume and then use the Detail Volume command, you see the following volume attributes:

Readonly: Yes
Hidden: No
No Default Drive Letter: Yes


For more information about error 258 in the cluster log file, click the following article number to view the article in the Microsoft Knowledge Base:

886702 You receive an error 258 in the cluster log file on a Windows Server 2003-based server cluster

For more information about the terms that are used in this article, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

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