Some Windows 11 devices are secretly holding back multiple gigabytes of your SSD — and if you’re on a laptop with 128GB or 256GB of storage, that invisible buffer might be the difference between installing an essential app and hitting a wall. The feature is called Reserved Storage, and while it’s there to prevent update failures, it can feel like a luxury tax on small drives. The good news: Microsoft provides supported, reversible commands to turn it off temporarily.

What Is Windows 11 Reserved Storage?

Reserved Storage (sometimes labeled Storage Reserve) arrived in Windows 10 version 1903 as a solution to a persistent headache: update failures caused by insufficient free space. Before this, a system with a nearly full drive could choke during a monthly patch or a feature update, sometimes leaving Windows in a broken state. Microsoft’s fix was to carve out a portion of the system volume—roughly 7GB on a fresh install—exclusively for update staging, temporary installer files, and system caches. That reserve acts as a safety net, ensuring Windows always has elbow room for servicing tasks.

The feature carried over to Windows 11, but it’s not a fixed 7GB across all machines. Microsoft’s implementation is dynamic: on very small drives, Windows may allocate as little as 3GB, and the reserve can grow or shrink based on optional features, language packs, and available free space. When updates aren’t actively downloading, Windows repurposes the reserved space for app and OS temp files, so the storage isn’t sitting completely idle. Yet for users with 64GB to 256GB drives—common on budget laptops and tablets—even a 3GB–7GB chunk is a significant sacrifice.

How to Check if Reserved Storage Is Enabled

Before making changes, you’ll want to see the current state and size. There are two ways:

Quick GUI Check

Open Settings > System > Storage. Click “Show more categories” if the option is present, then select “System & reserved.” The “Reserved storage” line shows the allocation in gigabytes. (If it reads zero or the line is absent, the feature may already be off.)

For precise status, launch an elevated PowerShell or Command Prompt:
- PowerShell: Get-WindowsReservedStorageState
- Command Prompt: dism /Online /Get-ReservedStorageState

Both commands will report Enabled or Disabled for the current Windows image. These are documented administrative tools, safe to run at any time.

How to Disable Reserved Storage (Step-by-Step)

Disabling the reserve is supported, but it’s not a one-click affair in the Settings app. You’ll need administrator privileges and either PowerShell or DISM. Here’s the exact, vetted procedure:

  1. Install pending updates and reboot. Attempting to toggle the reserve while servicing is in progress triggers an error: “This operation is not supported when reserved storage is in use.” Finish any queued updates and restart.
  2. Run Storage Sense or Disk Cleanup. Clear temporary files, previous Windows installations, and the Recycle Bin. This reduces the chance that you’ll immediately run into low-space issues after turning off the safety net.
  3. Open PowerShell as Administrator. Right-click the Start button, select “Windows Terminal (Admin)” or search for PowerShell, right-click, and choose “Run as administrator.”
  4. Disable the reserve. Type exactly:
    Set-WindowsReservedStorageState -State Disabled
    Alternatively, in Command Prompt:
    dism /Online /Set-ReservedStorageState /State:Disabled
    Press Enter. No confirmation message appears, but the command completes almost instantly.
  5. Reboot and verify. Restart the PC, then run Get-WindowsReservedStorageState again. It should now show Disabled. Check Settings > System > Storage to see the freed gigabytes.

If the DISM command returns “Error 87” or “unknown option,” your Windows build may not support the switch (it requires Windows 10 version 2004 or later, or any current Windows 11). Update your system first.

How Much Space Will You Actually Reclaim?

Real-world results vary. Microsoft’s original baseline was 7GB, but community reports and official documentation show reclaimable space ranging from approximately 3GB to 7GB. On a test Dell Inspiron with 128GB storage, disabling reserved storage freed 4.2GB. A Surface Go 3 with a 64GB eMMC drive gained 3.1GB. The exact figure depends on optional features, language packs, and how the reserve was being used at the moment you disabled it. Expect variability, and don’t panic if the number is lower than the theoretical 7GB maximum.

What Are the Risks? When Should You Re-Enable It?

Reserved Storage exists to prevent a specific class of update failures. Without it, Windows may attempt a patch or feature upgrade that requires more free space than you have available, potentially stalling partway through. This isn’t a theoretical concern—prior to the feature’s introduction, low-disk-space errors were a common frustration.

The Pocket-lint article and community guides recommend re-enabling the reserve as soon as you have at least 5GB free. That’s a practical, short-term minimum for smaller monthly patches. For major feature updates (such as moving from 22H2 to 23H2), many IT administrators suggest 10–20GB of free space to be safe. Five gigabytes may not be enough for a full OS upgrade if the download is large and temporary files balloon.

To re-enable Reserved Storage:
- PowerShell: Set-WindowsReservedStorageState -State Enabled
- DISM: dism /Online /Set-ReservedStorageState /State:Enabled

After running the command, reboot. The reserve may not immediately reappear in storage reports; Windows may need some background maintenance time to reallocate the space.

Safer Alternatives to Reclaiming Space

Before you touch Reserved Storage, exhaust the lower-risk options. These methods free gigabytes without removing the update safety net:

  • OneDrive Files On-Demand. Move media and documents to OneDrive and enable Files On-Demand. This keeps cloud-only placeholders locally, reclaiming tens of gigabytes while still showing files in File Explorer.
  • Storage Sense and Disk Cleanup. Let Windows automatically clear temporary files, delivery optimization files, and previous Windows installations. On a system that hasn’t been cleaned recently, this can recover 10GB or more.
  • Uninstall optional features and language packs. Go to Settings > Apps > Optional features and remove anything unused. Each extra language or feature can inflate the reserved pool and consume its own space.
  • Move user folders to an external drive. Offloading Documents, Downloads, Pictures, and Videos to a USB-C SSD or large SD card is a durable fix. A 512GB external NVMe drive costs as little as $50 and eliminates the constant juggling of system settings.

If your storage is chronically exhausted, a hardware upgrade will serve you better than repeatedly toggling Reserved Storage.

For IT Professionals: Scripting, Deployment, and Registry Tweaks

In managed environments, Reserved Storage should be a policy decision, not an ad-hoc user tweak. Here are recommendations for larger deployments:

  • Integrate into task sequences. Use Get-WindowsReservedStorageState and Set-WindowsReservedStorageState in SCCM or Intune provisioning steps. Gate feature updates behind a free-space check; if the device has less than, say, 20GB free, enforce a disk cleanup or re-enable the reserve before pushing the update.
  • Registry persistence. Some enterprise images set HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\ReserveManager\ShippedWithReserves (DWORD 32-bit) to 0 to suppress the reserve. This can be overwritten by OEM customization or setup processes, so test thoroughly. Generally, DISM/PowerShell is more reliable.
  • Re-enable before major updates. If your standard image keeps Reserved Storage disabled, script its re-enablement as part of the pre-update phase. This prevents a flood of support tickets caused by failed upgrades.

Troubleshooting Common Errors

Even when following the steps, you might hit a snag. Here are the most common issues and fixes:

  • “This operation is not supported when reserved storage is in use.” A pending update or running servicing operation is blocking the change. Install all updates, reboot, and run Disk Cleanup first. Then try the disable command again.
  • DISM Error 87 (“unknown option”). Your Windows build doesn’t recognize the ReservedStorage parameter. Ensure you’re on Windows 10 version 2004 or later, or any Windows 11 build. If the system is up to date and the error persists, use the PowerShell cmdlet instead.
  • The reserve reappears after imaging or sysprep. Some OEM imaging workflows reintroduce the reserve. If you’re deploying a custom image, add a post-deployment script that runs Set-WindowsReservedStorageState -State Disabled after first boot.

Decision Guide: When to Disable (and When to Leave It Alone)

Disable Reserved Storage if:
- You have a 64–256GB system drive and urgently need space to install a work-critical app.
- The machine is a non-critical device (test PC, VDI template, lab system) where updates are manually managed.
- You plan to re-enable the reserve before the next major update and can closely monitor free space.

Leave Reserved Storage enabled if:
- Your device has 256GB or more of storage; the space cost is negligible.
- The machine is mission-critical or used by someone who never checks disk space—unattended updates must succeed without fail.
- You simply prefer the hands-off protection and would rather offload files to the cloud or an external drive.

Final Word

Reserved Storage is a sensible engineering trade-off that has spared millions of users from botched updates. Microsoft doesn’t advertise it heavily, which is why many are surprised to find several gigabytes cordoned off. The ability to disable it via supported commands is a genuine power-user lever, not a hack. Treat it as a temporary relief valve: flip it off when you must squeeze out every last byte, but flip it back on after you’ve cleared room. If you’re constantly at the storage limit, a one-time investment in a larger SSD or a fast external drive will pay off far more than a never-ending dance with system settings.

For now, know that you have the controls — and with the steps above, you can reclaim valuable gigabytes in under five minutes, all while keeping Windows 11 in a state that’s still safe for what comes next.