Start by checking whether Linux has actually run out of filesystem space. In WSL 2, a distribution’s ext4.vhdx can have a large virtual maximum while using less space on the Windows drive; a read-only mount, meanwhile, calls for filesystem repair rather than resizing. The steps below cover WSL 2 on Windows, with separate procedures for expanding Linux capacity, repairing a read-only disk, and reclaiming host storage.
First, identify which disk-space problem you have
In PowerShell, check the Linux filesystem for the affected distribution. Replace the placeholder with its registered distribution name:
wsl.exe --system -d <distribution-name> df -h /mnt/wslg/distroRead the Size, Used, and Avail columns. If this command is unavailable, Microsoft suggests updating Store WSL with wsl --update and trying wsl df -h / instead. See Microsoft’s WSL disk-space guidance.
- Linux filesystem full: If available space is near zero, find what is consuming it. If the filesystem has reached its capacity, expand it using the applicable procedure below.
- Windows drive low on space: Check free space in Windows separately. The VHD expands as needed, but its virtual maximum is not space reserved on the host drive.
- Distribution mounted read-only: Treat this as a possible ext4 filesystem problem. Do not try to solve it by increasing the VHD maximum.
For context, Microsoft’s disk-space page, last updated February 5, 2025, gives 1 TB as the current default maximum virtual capacity per WSL VHD. Older WSL defaults cited on that page were 512 GB and 256 GB. Those are virtual capacity limits, not measures of free physical storage on the Windows drive. WSL 1 does not use this WSL 2 VHD repair workflow.
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Expand a WSL 2 disk when Linux is genuinely out of space
Microsoft documents two approaches: the --resize command for WSL 2.5 or later, and a manual DiskPart plus resize2fs procedure for older installations. Confirm your WSL version and distribution name before proceeding. Back up important files before changing a virtual disk.
| Approach | When to use it | What it involves |
|---|---|---|
wsl --manage --resize |
WSL 2.5 or later | Shut down WSL, then run one resize command. No manual VHD selection or separate ext4 resize step is required by the documented command. |
DiskPart and resize2fs |
Older WSL installations without the resize command | Shut down WSL, select and enlarge the correct VHD in elevated Command Prompt using DiskPart, then expand ext4 from the distribution. Requires careful VHD and target-size selection. |
WSL 2.5 or later: use the resize command
-
In PowerShell, stop all WSL instances:
wsl.exe --shutdown -
Set the desired virtual disk size, substituting the distribution name and an integer size:
wsl --manage <distribution-name> --resize <size>Use an accepted integer size such as
2GBor2TB. Microsoft says decimal values such as2.5TBare not supported by this syntax.
Check the Linux filesystem again with df -h to confirm the available capacity. Increasing the VHD maximum does not create free space on the Windows drive; ensure the host has room for the VHD to grow.
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Older WSL: use Microsoft’s manual expansion route
This method requires finding the right VHD, using DiskPart from an elevated Command Prompt to increase its virtual maximum, and then running resize2fs in the WSL 2 distribution. Follow Microsoft’s current manual expansion instructions for the exact DiskPart and Linux commands. Do not set a larger maximum than you intend: reducing a virtual disk later is more complicated. This route is not for WSL 1.
To locate the VHD path for a registered distribution, Microsoft documents this PowerShell query:
(Get-ChildItem -Path HKCU:SoftwareMicrosoftWindowsCurrentVersionLxss |
Where-Object { $_.GetValue("DistributionName") -eq '<distribution-name>' }).GetValue("BasePath") + "ext4.vhdx"Do not open, move, edit, or manipulate the VHD while WSL is using it. Microsoft warns that Windows tools and editors accessing WSL-managed files in AppData can corrupt a distribution; use supported WSL commands and access paths instead.
Repair a WSL distribution mounted read-only
After an unexpected shutdown or power outage, WSL may mount a VHD read-only to avoid data loss. A reported symptom is the message “An error occurred mounting the distribution disk, it was mounted read-only as a fallback,” followed by write failures. Microsoft’s documented recovery uses e2fsck to check and repair the ext4 filesystem. Back up what you can before repair, and never guess the block-device name.
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Shut down WSL:
wsl.exe --shutdown -
Attach the affected distribution’s VHD in bare mode. Replace the path with the correct
ext4.vhdxpath:wsl.exe --mount <path-to-ext4.vhdx> --vhd --bare -
List block devices and identify the device belonging to that VHD:
wsl.exe lsblk -
Run the filesystem check against the device you identified, not an assumed
/dev/sdX:wsl.exe sudo e2fsck -f /dev/<device> -
Unmount the attached disk:
wsl.exe --unmount
Microsoft notes two possible obstacles: with only one Linux distribution installed, an “ext file in use” error may prevent lsblk from running; its guidance suggests temporarily installing another distribution, then removing it after repair. If Docker Desktop triggers ERROR_SHARING_VIOLATION, close Docker Desktop and retry.
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Do not use sudo mount -o remount,rw / as a lasting fix. Microsoft warns that changes made that way exist only in memory and are lost when the distribution restarts. Follow Microsoft’s read-only mount repair steps if your device layout or error differs.
Fix the virtual disk system limitation error
If Windows reports “The requested operation could not be completed due to a virtual disk system limitation. Virtual hard disk files must be uncompressed and unencrypted and must not be sparse,” follow Microsoft’s troubleshooting steps for the distribution’s LocalState folder:
-
Locate the affected distribution’s folder under your Windows user profile and open its
LocalStatefolder. -
Clear the folder’s compression attribute. If encryption is enabled, clear that as well. If Windows asks whether to apply the compression change to the folder and all contents, Microsoft says to apply the compression change to the folder only.
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Check the distribution’s sparse-VHD configuration before changing sparse settings or attempting compaction.
Microsoft’s WSL troubleshooting guide states that VHDs involved in this limitation must be uncompressed, unencrypted, and not sparse. Sparse VHD support is a separate WSL feature, so do not assume it is enabled or disable it without checking the current setup.
Reclaim Windows storage after deleting Linux files
Removing files inside Linux frees filesystem blocks, but the Windows-side VHD file may not immediately become smaller. Microsoft describes sparse VHDs as able to shrink automatically as they are used, and documents enabling or disabling sparse mode for an existing distribution with wsl --manage <distro> --set-sparse <true/false>. The sparseVhd setting is an opt-in for newly created VHDs. See Microsoft’s September 2023 WSL update for the feature details. Sparse behavior is distinct from increasing Linux filesystem capacity and may conflict with the file-attribute requirements in the virtual disk limitation error.
Manual Hyper-V compaction with Optimize-VHD is another option only when supported by the installed Windows and Hyper-V setup. Microsoft says the VHD must be detached or attached read-only for applicable modes; optimization may complete without reducing file size if no space can be reclaimed. Its modes have different constraints:
- Full: Scans for zero blocks and is permitted only when the disk is read-only.
- Quick: Reclaims unused blocks without scanning for zero blocks; also read-only-only.
- Retrim: Sends trim requests without reclaiming blocks and requires read-only attachment.
- Pretrimmed and Prezeroed: Do not require read-only attachment, but detect unused space less effectively.
Consult Microsoft’s Optimize-VHD documentation for the cmdlet’s requirements. Do not assume Optimize-VHD -Mode Full applies to every sparse WSL VHD.
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