Your Windows 11 PC is silently hoarding gigabytes of disk space for updates you might not need right now. This storage cushion, known as Reserved Storage, is meant to keep your system stable—but when your drive is bursting at the seams, disabling it can instantly reclaim up to 7GB or more. The feature arrived with the Windows 10 May 2019 Update, a direct answer to a chronic pain point: feature and quality updates failing because the system ran out of free space during download or installation. Today, it remains an invisible warden on Windows 11 devices, quietly carving out a buffer so that you don’t have to delete personal files just to install a security fix. For many with spacious SSDs, it goes unnoticed. For those on 64GB eMMC drives or tightly packed 128GB SATA disks, every gigabyte counts—and that’s when the desire to flip the switch becomes acute.
What Is Reserved Storage Actually Doing?
Reserved Storage is not a dedicated invisible partition. It’s a logical reservation on your system volume that Windows sets aside for update-related files, temporary installer data, and system caches. On a fresh install, Microsoft originally targeted roughly 7 GB as the baseline, but the practical allocation is dynamic. Your device might see 4.95 GB, as reported in one test, or as little as 3 GB on a nearly full drive. Some community observations peg it at around 2% of total system volume capacity, growing over time when free space permits. The common thread: this isn’t a fixed 7 GB carve‑out that applies uniformly; it’s a smartly scaled buffer.
When there are no pending update files to store, Windows repurposes the space for temporary files and caches generated by installed apps and services. Storage Sense and other housekeeping routines then clear stale data from that area, keeping it available for its primary duty. Crucially, Reserved Storage lives only on the OS volume. You cannot move it to a secondary drive, because the update engine needs guaranteed, local workspace. That design choice is what makes it reliable—and what makes it sting when that volume is a small embedded SSD.
How to Check Your Reserved Storage Footprint
Before you reach for the kill switch, find out exactly how much space is being held. The quickest path is through Windows Settings:
- Open Settings > System > Storage.
- Select Show more categories, then click System & reserved.
- Under Reserved Storage, you’ll see the current allocation.
For a command-line view, open an elevated Command Prompt and run:
DISM /Online /Get-ReservedStorageState
Alternatively, PowerShell can query the state with:
Get-WindowsReservedStorageState
Both methods reveal whether Reserved Storage is enabled and, in some contexts, the size of the reservation. The DISM command is more universally available across Windows builds, while PowerShell cmdlets may be absent on certain editions or older feature updates. Either way, you’ll get a clear answer.
Two Supported Ways to Toggle Reserved Storage
There is no friendly on/off switch in the Settings app. The feature is controlled through system administration commands, executed with elevated privileges.
Option 1: DISM (most broadly supported)
- Check state:
DISM /Online /Get-ReservedStorageState - Disable:
DISM /Online /Set-ReservedStorageState /State:Disabled - Re-enable:
DISM /Online /Set-ReservedStorageState /State:Enabled
Option 2: PowerShell
- Check state:
Get-WindowsReservedStorageState - Disable:
Set-WindowsReservedStorageState -State Disabled - Re-enable:
Set-WindowsReservedStorageState -State Enabled
Both approaches require a reboot to finalize the change. If you encounter the error “This operation is not supported when reserved storage is in use,” it means Windows has already downloaded update content that it needs to process. Install all pending updates and reboot before retrying the disable command.
Step-by-Step: Disabling Reserved Storage Safely
If you’re facing a storage emergency and have exhausted other cleanup avenues, follow this sequence to minimize risk:
- Install pending updates first. A half-downloaded feature update will block the toggle. Let Windows finish its business, then reboot.
- Run Storage Sense or Disk Cleanup. Clear temporary files, empty the Recycle Bin, and remove Windows Update Cleanup leftovers. This ensures you’re not disabling a safety net while obvious junk remains.
- Open an elevated command prompt. Right‑click Command Prompt or PowerShell, choose “Run as administrator.”
- Execute the disable command. For example, via DISM:
DISM /Online /Set-ReservedStorageState /State:Disabled
Or via PowerShell:
Set-WindowsReservedStorageState -State Disabled - Reboot your PC. After restart, the reserved space is released to the system volume.
What to Expect After Disabling
A successful toggle usually frees several gigabytes. Community reports vary—some see a full 7 GB returned, others recover 3–5 GB, and some note that the free space slowly gets consumed again by temporary caches unless you re-enable the feature. The immediate relief is real, but the long‑term trade‑offs are important.
- Update fragility: Without the dedicated buffer, Windows may hit a disk‑space wall during a feature update. The very problem Reserved Storage was designed to prevent can reappear, potentially leaving you with a failed installation and a system in recovery.
- Storage Sense still operates: Windows will continue to manage temporary files, but it no longer has the reserved pool to lean on for update staging. That means you’ll need to manually ensure there’s enough free space when a major update arrives.
- Reclaimed space isn’t permanent: The OS can opportunistically use freed space for app caches or user data. If you don’t re‑enable Reserved Storage before a large update, you might end up scrambling again.
Safer Alternatives to Regain Space
Before you disable a system reliability feature, exhaust every other sensible option. Most users can reclaim tens of gigabytes without touching Reserved Storage.
- OneDrive Files On‑Demand: Keep files cloud‑only and free local storage while retaining full access through placeholder files.
- Storage Sense & Disk Cleanup: Let Windows automatically delete temporary files, previous Windows installations, and update delivery optimization files. Run Disk Cleanup as administrator and select “Clean up system files.”
- Uninstall optional features and language packs: Go to Settings > Apps > Optional features, and also check language settings. Unused language packs and features like Windows Media Player or the Tablet PC Math Input Panel can reclaim gigabytes.
- Move user folders: Redirect Documents, Downloads, Pictures, and Videos to a secondary drive or external SSD. This preserves your data without deleting anything.
- Upgrade storage: For persistently tight devices, replacing the internal SSD or adding a high‑speed USB‑C external drive is the most durable solution.
Risks, Caveats, and Recovery
Disabling Reserved Storage is not a one‑way street, but it does introduce hazards you should understand.
Key risks:
- Update failures: A feature update requiring more space than what’s free can fail with error codes like 0x80070070. Recovering from a botched upgrade can mean rolling back or performing an in‑place repair.
- Unpredictable reclaim amounts: You might expect 7 GB and get only 3 GB, depending on your system configuration and how far along Windows was in caching temporary content.
- Operation blocked: As noted, pending updates lock the feature. You must clear them first, which itself consumes time and bandwidth.
How to recover:
- Before a big update: Re‑enable Reserved Storage (Set-WindowsReservedStorageState -State Enabled or its DISM equivalent) and reboot. This gives Windows a chance to rebuild its buffer.
- If updates fail after disabling: Free space by any means necessary—external drive, cloud offloading, uninstalling large apps—then re‑enable the feature. Once re‑enabled, retry the update.
Practical Recommendations: When to Disable and When to Keep It
Consider disabling if:
- You have a one‑off emergency where a critical application or file must be installed immediately, and no other cleanup method works.
- The device is a secondary or disposable machine where update reliability isn’t a priority.
- You are a power user who will remember to re‑enable Reserved Storage before each feature update.
Definitely keep it enabled if:
- The system is mission‑critical—a workstation, point‑of‑sale terminal, or business laptop that must stay updateable without manual oversight.
- You routinely install feature updates and don’t want to babysit free space during upgrades.
- You lack a reliable plan to re‑enable the feature before major updates arrive.
Advanced Tips for Power Users
- Scripted toggles: Create a short script that disables Reserved Storage, performs a space‑intensive task (like unpacking a large archive), then re‑enables it. Always test on a non‑critical machine first.
- Monitor System & reserved: Bookmark Settings > System > Storage > System & reserved to quickly check the reserved size and verify changes.
- Combine with one‑off cleanups: After disabling, immediately run Disk Cleanup on system files to capture any leftovers that previously lived inside the reservation.
FAQ
Does disabling Reserved Storage break Windows?
No. The OS runs normally. The only downside is a higher chance of update failures due to insufficient free space.
Is the reclaimed space permanent?
Not exactly. Windows may gradually consume some of that space for temporary caches and user files unless you re‑enable Reserved Storage.
Can I move Reserved Storage to another drive?
No. The reservation is tied to the system volume by design. Moving it would defeat the purpose of a guaranteed local workspace for updates.
Will my existing files be deleted when I disable it?
No. Disabling only releases the reserved allocation; your personal files and installed apps remain intact.
Final Analysis: A Deliberate Trade‑Off
Reserved Storage is an engineering response to a very real problem—update failures that can cascade into support headaches, lost productivity, and, in extreme cases, data loss. For the vast majority of Windows 11 users, leaving it enabled is the prudent choice. It operates silently, scales its appetite to what the system can spare, and dramatically reduces the risk of being caught out by a bloated feature update.
Yet the feature is not sacred. On devices where every gigabyte is precious—tablets with 64GB of soldered storage, budget laptops with eMMC memory, or virtual machines with tightly allocated virtual disks—disabling Reserved Storage can be the difference between finishing a project and staring at a “disk full” message. The key is to treat the toggle as a temporary expedient, not a permanent setting. Disable it for a specific task, then re‑enable before the next Patch Tuesday. Combine it with aggressive file cleanup, cloud offloading, or a long‑term storage upgrade plan.
If you decide to pull the trigger, follow the safe procedure: install pending updates, clear the obvious junk, run the command, and reboot. Respect the guardrails Microsoft built into the process. With a disciplined approach, you can reclaim valuable space without sacrificing your system’s ability to stay secure and current. For everyone else, let Reserved Storage do its quiet work—it’s the cheapest insurance policy your hard drive can buy.