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Repair Windows errors before they cause bigger problemsFix Now →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →To shrink the Windows storage used by a WSL 2 distribution, first remove only unneeded data inside Linux, then shut WSL down and compact its VHDX if it is not already reclaiming space as a sparse file. Deleting Linux files alone may increase free space inside the distribution without reducing the VHDX’s physical allocation on Windows. Compaction can reclaim physical storage, but it does not necessarily reduce the disk’s maximum virtual capacity.
What “shrink” means for a WSL disk
Three different measurements matter, and they are not interchangeable:
- Linux free space: space available to applications inside the distribution, which you can inspect with
df -h /. - Windows physical allocation: the storage the VHDX currently occupies on the Windows drive. In File Explorer, compare the file’s logical size with Size on disk.
- Maximum virtual capacity: the disk’s ceiling for how large it can grow. Microsoft’s current WSL disk-space documentation gives 1 TB as the default maximum for current WSL VHDs and notes historical defaults of 512 GB and 256 GB for earlier releases. These are virtual-capacity defaults, not the amount of Windows storage the VHDX consumes. See Microsoft’s WSL disk-space guide.
This procedure is about reclaiming Windows storage by reducing physical allocation. It is not a general method for lowering a VHD’s maximum virtual capacity. The WSL guide documents wsl --manage --resize for expansion in WSL 2.5 and later; it does not establish that command as a shrink operation.
Why a WSL VHDX may not get smaller after deleting files
WSL 2 stores a distribution in an ext4-formatted VHDX on the Windows host. When you delete files in Linux, the filesystem can report more free space while the VHDX still occupies the same amount on Windows. A dynamically expanding VHDX can retain its host allocation until unused blocks are compacted.
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Sparse-file behavior can change that diagnosis: a sparse VHDX may deallocate storage within the file as blocks become unused. Microsoft documents sparse-file behavior generally, but current WSL sparse behavior is configuration-dependent; a community discussion is not a universal procedure. Check the actual VHDX’s sparse status and Size on disk before assuming compaction is needed. See Microsoft’s fsutil sparse documentation and the WSL community discussion.
Safely prepare the distribution
- Check Linux-side use. Open the intended distribution and run
df -h /. This reports filesystem capacity and available space inside Linux; compare it with the Windows VHDX’s physical allocation rather than treating either number as a substitute for the other. - Clean up known-unneeded data inside Linux. Use the package manager or application-specific cleanup appropriate to your distribution and workload. Avoid broad deletion commands: removing data still needed by Linux will not help, and Linux-side deletion does not by itself promise a smaller Windows allocation.
- Export important data before maintenance. From PowerShell or Command Prompt, use
wsl --export <DistributionName> <FileName>to create an archive backup. WSL 2 also supports VHDX export withwsl --export <DistributionName> <FileName> --vhd. Check the distribution name withwsl --list --verboseand consult Microsoft’s WSL basic commands reference for export details. - Stop WSL before host-side maintenance. Run
wsl --shutdown. Microsoft uses this step in its disk maintenance guidance. - Locate the correct VHDX. Identify the VHDX belonging to the distribution you intend to maintain using Microsoft’s registry-based lookup in the WSL disk-space guide. Do not guess based on a folder name or compact a different distribution’s disk.
- Check allocation and sparse state. Inspect the correct file’s Size on disk and sparse status. If Windows is already deallocating blocks and physical allocation is falling, additional compaction may not be necessary.
Microsoft warns against modifying, moving, or accessing WSL-related files under AppData with Windows tools or editors because doing so can corrupt a distribution. Use supported WSL commands and the documented disk tools; do not open or edit the VHDX contents directly.
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Choose a compaction tool for the VHDX state
For a non-sparse dynamically expanding VHD, Microsoft documents two relevant Windows tools. Both have disk-state requirements: the VHD must be detached or attached read-only for the selected operation. Shutting WSL down is important, but do not assume it alone satisfies every tool’s attachment requirements.
| Option | Availability | Requirement and result |
|---|---|---|
DiskPart compact vdisk |
DiskPart is available in Windows. | The dynamically expanding disk must be detached or attached read-only. The command reduces physical size where reclaimable blocks are available; it does not establish a smaller maximum virtual capacity. See Microsoft’s compact vdisk reference. |
Hyper-V Optimize-VHD |
Requires the Hyper-V PowerShell module to be available. | The VHD must be detached or read-only. Full mode scans for zero blocks and reclaims unused blocks. The command can succeed without reducing file size if no optimization is possible. See Microsoft’s Optimize-VHD reference. |
These are Microsoft-documented virtual-disk compaction tools, not a single universal WSL shrink command. Check the target VHDX’s state and follow the selected tool’s requirements rather than attaching or modifying it casually.
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Verify whether Windows storage was reclaimed
After the operation, compare the same VHDX’s Size on disk with its pre-maintenance value. A smaller physical allocation means Windows storage was reclaimed. If the operation reports success but the physical allocation is unchanged, there may have been no reclaimable blocks; Microsoft explicitly notes this possibility for Optimize-VHD. A VHDX’s logical size or maximum virtual capacity alone does not show how much physical storage Windows recovered.
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If the VHDX still occupies the same space
- Linux still has little free space: the distribution may not have enough unused blocks to reclaim. Recheck
df -h /and remove only data you know is no longer needed. - The VHDX is sparse: physical allocation may already be managed through sparse-file deallocation. Judge by the current Size on disk and configuration rather than applying a non-sparse workflow automatically.
- The tool could not operate on the disk: verify that WSL is shut down, the selected VHDX belongs to the intended distribution, and the disk is detached or read-only as required by DiskPart or Hyper-V.
- The tool completed but size did not change: there may be no optimizable blocks. Compaction is not guaranteed to yield a particular amount of reclaimed storage.
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