When a change is made to the disk, Windows does not automatically update the file system. While you have increased the physical disk size, the file system still sees only the space you had before.
You will need to update the file system manually using diskpart – a command-line utility available in Windows.
To open diskpart:
diskpart
To update your server in diskpart:
list disk
sel disk 0
Where the number is the disk you have upgraded
list part
sel part 2
extend filesystem
Article ID: 89
Created On: Thu, Mar 5, 2015 at 3:18 PM
Last Updated On: Wed, Aug 18, 2021 at 3:44 PM
Online URL: https://www.heartinternet.uk/support/article/i-ve-increased-the-hard-disk-size-but-why-hasn-t-it-upgraded-in-windows.html