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support/windows-server/active-directory/inter-forest-password-migration-with-admtv2.md

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+---
+title: Can't extend drive C because Extend Volume isn't available
+description: Discusses an issue in which you can't extend drive C in Windows because the Extend Volume command isn't available in the Disk Management tool.
+ms.date: 02/27/2026
+author: kaushika-msft
+ms.author: kaushika
+manager: dcscontentpm
+audience: itpro
+ms.topic: troubleshooting
+ms.reviewer: kaushika, simonw, v-appelgatet
+ai.usage: ai-assisted
+ms.custom:
+- sap:backup,recovery,disk,and storage\data corruption and disk errors
+- pcy:WinComm Storage High Avail
+appliesto:
+  - <a href=https://learn.microsoft.com/windows/release-health/windows-server-release-info target=_blank>Supported versions of Windows Server</a>
+---
+
+# No Extend Volume command for drive C in Disk Management
+
+## Summary
+
+This article discusses how to fix an issue in which you can't extend drive C in Windows because the **Extend Volume** command isn't available in the Disk Management tool. This issue usually occurs because unallocated space isn't immediately next to the partition that you want to expand. This article also explains how to verify the layout of the partitions, make the required unallocated space contiguous, and then safely extend drive C.
+
+## Symptoms
+
+In the Disk Management tool, you right-click drive C to try to extend the drive. However, the **Extend Volume** command is unavailable (grayed out). You might also see error messages that indicate that the drive can't be extended.
+
+## Cause
+
+This issue occurs if the unallocated space on the disk isn't directly next to the drive C partition. In the Disk Management tool, you can extend a volume into only unallocated space that's immediately next to the volume. If the unallocated space is on another part of the disk, or if it isn't correctly assigned, the extension command is disabled.
+
+## Resolution
+
+To resolve this issue, make sure that the unallocated space is directly next to drive C. Then, extend drive C.
+
+> [!IMPORTANT]  
+> Always back up your data before making changes to disk partitions.
+
+1. To review the partition map of the disk that hosts the drive C volume, use Disk Management. Select **Start**, enter *disk management*, and then select **Disk Management** in the search results.
+
+1. Look for any partitions that appear between drive C and the unallocated space on the drive.
+
+1. Move or remove the partitions that you found in the previous step. You can use a third-party partition management tool, or you can back up the partitions, and then delete them. You can restore the partitions and content after you extend drive C.
+
+1. In Disk Management, right-click drive C, and then select **Extend Volume**. Follow the instructions in the wizard.
+
+## Data collection
+
+If you need assistance from Microsoft Support, gather the following information before you create a support request:
+
+- A screenshot of the Disk Management tool that shows all the partitions and unallocated space.
+- The version of Windows that you're using. To find this information, go to **Settings** > **System** > **About**.
+- Any error messages that you received when you tried to extend drive C.