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When you use the Microsoft Windows Preinstallation Environment (WinPE) Boot CD to start your computer, you may not be able to view drive C. If you use the Diskpart.exe command-line tool to delete or clean the drive, you may receive the following error message:
The selected disk is necessary to the operation of your computer, and may not be cleaned.
Note Diskpart.exe may read the drive as "Volume 0" with no drive letter.
This problem may occur when the drive is a dynamic disk that has the volume label "C:".
Service pack information
To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
322389 How to obtain the latest Windows XP service pack
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:
Note 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.The English version of this fix has the file attributes (or later) 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 -------------------------------------------------------------- 13-Nov-2002 16:28 5.1.3561.0 151,040 Diskpart.exe 12-Nov-2002 16:33 5.1.2600.1143 486,400 Xpsp2res.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows XP Service Pack 2.
Use the delete partition command to delete the partition that has the focus. Use the clean command to remove partition or volume formatting from the disk that has the focus by zeroing sectors. By default, only the master boot record (MBR) or GUID partition table (GPT) partitioning information and any hidden sector information on MBR disks is overwritten.For additional information about the Diskpart command-line utility, click the following article number to view the article in the Microsoft Knowledge Base:
300415 A Description of the Diskpart Command-Line Utility