Common Question: Is it possible to increase the amount I can shrink my volume?
Windows Limitation: In Disk Management, the maximum available MB shown is the absolute limit using Microsoft's built-in tools.
The Solution: While you can't extend Windows' shrink limit, you can use the free Partition Resizer tool to shrink volumes when Disk Management or Diskpart fails. This tool often allows more flexibility than Windows' native tools.
How Partition Resizer Works:
Video Tutorial: See how to shrink your C drive and allocate space to another partition
Download Options:
For Windows 11/10/8/7 → Download Partition Resizer Free [100% Free]
For Windows Server 2025-2003 → Download Partition Resizer Server [Free Demo]
When Windows reports this error, it typically means:
Solution: Partition Resizer can often shrink volumes even when Windows tools fail, as it handles unmovable files differently than Disk Management.
Windows sometimes incorrectly calculates available shrink space because of:
Key Fact: While Windows might show 100GB as available, the actual shrinkable space might be much less due to these factors.
Workaround: Partition Resizer can often reclaim more space by working around these limitations in Windows 11, 10, 8, 7, and Server versions.
Also read: how to shrink C extend another drive