When you open Disk Management, the volume size (i.e., capacity) may be misreported in the top pane. The bottom pane, which shows the graphical view, may report the capacity correctly for each volume.
Although the exact cause is not known, you can fix the issue using Diskpart.
Note: Before using Diskpart or any other disk management tool, it is recommended to back up the data from the specific partition to an external drive, just in case.
Resolution
Run the following commands from an administrator command prompt:
diskpart list volume select volume E -- In the above screenshot, volume E 's capacity is incorrect. So, we select this volume. extend filesystem exit
Note:
In the list volume output, note the volume number or the drive letter of the volume that is facing the issue. Then, select that volume using the select volume # command. Once selected, run the extend filesystem command. You should see the output, “Diskpart successfully extended the file system on the volume.”
That should resolve the issue.
References
The partition size is extended, but the file system remains the original size when you extend an NTFS volume:
https://web.archive.org/web/20110109201933/http://support.microsoft.com/kb/832316
Windows Server showing incorrect disk size after configuring partition:
https://evoxt.com/windows/windows-server-showing-incorrect-disk-size-after-configuring-partition/
Disk Management shows incorrect volume size – Super User:
https://superuser.com/questions/889458/disk-management-shows-incorrect-volume-size
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