My problem is exactly the same: I upgraded from Windows 7 to 10 on a 250GB disk, cloned it to a 1TB disk and ended up with a 232GB system partition (C:), directly followed by a 450MB recovery partition, followed by close to 700GB unallocated space. I would like to extend C: to the unallocated space.
Extend Volume Option is Grayed Out in Windows Disk Management Console. Open Disk Management console (diskmgmt.msc) and right-click on the partition you want to expand (in my example, it's a logical volume assigned the drive letter C:\).As you can see, the Extend Volume option is grayed out. The fact is that you can extend a volume in Windows only if there is an Unallocated space to the right
In WIndows 10 Disk Management I see: C: 54 GB NTFS 529 MB one 56 GB unallocated. I don't have an option to resize (guess there is this 529 one) but also I can't create new one in unallocated space. After using chkdsk there are no errors and file system is NTFS. I tried to resize with diskpart.
User can extend specified partition by taking free space from other partition on the same disk. I have no idea why it shows the 230gb unallocated in the dropdown, it is contrary to the wording of the message.. You could extend C to incorporate that 70.6gb unallocated space. When it is inside partition C it becomes free space.
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To start, open the Start menu, right-click on "Computer," and select "Manage.". In the Computer Management window, navigate to "Storage" and click on "Disk Management.". In the Disk Management window, locate the unallocated partition, represented as unallocated space with a black bar. Right-click on the unallocated space and

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unallocated space windows 10 cannot use