The Windows 11 storage bug is one of the most disruptive silent failures Microsoft has acknowledged in recent memory — a permissions-related system folder quietly ballooning to 500GB or more, with many users completely unaware until their drive is nearly full. Microsoft confirmed the issue in July 2026 and has pledged a fix via the Patch Tuesday update on 14 July 2026. Here’s everything you need to know: what’s causing it, which versions are affected, and the precise steps to check and remedy the problem on your PC right now.
What Is the Windows 11 Storage Bug?
At the heart of this Windows 11 disk space problem is a folder tied to the Capability Access Manager (CAM) — the Windows subsystem responsible for tracking app permission requests for the camera, microphone, and location services. Under normal circumstances this folder stays small, holding only lightweight log entries. Due to a bug introduced in a recent cumulative update, however, the folder fails to trim its logs and can grow without limit, with some users reporting it has swollen to 500GB or beyond on affected systems.
What makes this especially frustrating is that Windows hides the folder from standard Explorer views. Users typically notice the symptom first — a hard drive that keeps getting fuller despite deleting files — rather than the cause. A Microsoft customer support representative reportedly even suggested purchasing a new hard drive before the root cause was identified, illustrating just how stealthy this Windows storage issue truly is.
Which Windows 11 Versions Are Affected?
According to reporting by Windows Latest and corroborated by The Verge and PCWorld, the bug affects systems running Windows 11 with recent cumulative updates applied — primarily those on version 24H2 and 23H2. Both Windows 11 Home and Windows 11 Pro builds are impacted. The problem appears to have been introduced through an update rolled out in mid-2026, meaning the more up to date your Windows installation was before the fix arrived, the more likely you are to be affected.
- Windows 11 24H2 — confirmed affected; highest reported cases
- Windows 11 23H2 — confirmed affected on many devices
- Windows 11 22H2 — some users report similar symptoms; monitor your storage
- Windows 10 — not currently confirmed as affected by this specific bug
If you are running Windows 11 on any of these builds and have noticed unexplained disk usage growth over the past few weeks, your system is worth investigating.
How to Check If the Windows 11 Storage Bug Is on Your PC
Identifying the Windows 11 storage bug takes a few deliberate steps because the offending folder is not visible through normal browsing. Follow these instructions carefully:
- Open Windows Settings — press
Windows + Iand navigate to System > Storage. Check whether your drive usage is significantly higher than expected given the files you know you have stored. - Run Disk Cleanup — search for “Disk Cleanup” in the Start menu, select your system drive (usually C:), and click “Clean up system files.” Review the categories listed; if the total recoverable space seems unusually large, continue investigating.
- Use Storage Sense analysis — still within System > Storage, select “Other” or “System & reserved” to review unexplained usage. Large figures here that don’t correspond to obvious files are a red flag.
- Check via Command Prompt (advanced) — open an elevated Command Prompt (Run as Administrator) and run
dir /a C:\ProgramData\Microsoft\Windows\AppRepository\to look for unusually large subdirectories. On affected systems, certain CAM-related logs within this broader area are the culprit. - Use WinDirStat or TreeSize Free — third-party disk analysis tools can surface hidden and system-protected folders that Explorer conceals. If you see any folder approaching tens or hundreds of gigabytes that you cannot explain, it is likely related to this Windows storage issue.
The Official Windows 11 Storage Fix from Microsoft
Microsoft’s official Windows 11 storage fix was quietly included in the optional June 2026 cumulative update and will be pushed as a mandatory patch via Patch Tuesday on 14 July 2026. This is the safest and most complete remediation path — it addresses the root cause in the Capability Access Manager rather than just clearing the accumulated data.
Option 1: Install the Official Update (Recommended)
Head to Settings > Windows Update > Check for updates. If the optional June 2026 update is available, install it now rather than waiting for the 14 July mandatory rollout. After the update installs and your PC restarts, Windows will properly manage the CAM log folder going forward, preventing further runaway growth.
Option 2: Manual Deletion (Intermediate)
If you cannot install the update immediately and need to reclaim space urgently, you can manually delete the bloated log folder — but proceed with caution. Incorrect deletion can disrupt app permission behaviour. Create a system restore point first, then navigate to the hidden folder path using an elevated Command Prompt. Several tech publications, including PCWorld, have outlined the exact folder path; cross-reference with the latest official guidance before proceeding, as the specific location may vary slightly by build.
Option 3: Use Storage Sense
Enabling Storage Sense (Settings > System > Storage > Storage Sense) won’t fix the underlying Windows 11 disk space leak directly, but it can help reclaim some categorised temporary files automatically. Think of it as a sticking plaster — useful alongside the main fix, not as a replacement.
Why This Windows Storage Issue Matters
A 500GB storage bleed is not a minor annoyance — for many users, that represents their entire drive. Entry-level laptops and budget desktops often ship with 256GB or 512GB SSDs. Losing all or most of that capacity to an invisible system bug can render a machine barely functional: apps crash, updates fail to install, and performance degrades sharply as the drive approaches capacity. SSDs in particular slow down and wear faster when consistently near full.
Beyond performance, the bug also highlights the risk of deferring Windows updates. Ironically, the fix for this Windows 11 storage bug is itself delivered via Windows Update — the very channel that introduced the problem. Microsoft’s advice remains to stay current with updates, and the July 14 patch is a case in point: it cleans up a mess the previous update made.
How to Protect Your PC Going Forward
Once you have applied the fix, a few habits will keep your disk in good shape and make future bugs like this easier to spot early:
- Enable Storage Sense to automate temporary file cleanup on a weekly or monthly schedule.
- Audit disk usage monthly — a quick glance at Settings > Storage takes 30 seconds and can flag anomalies before they become catastrophic.
- Keep a disk analysis tool installed — WinDirStat, TreeSize Free, or the built-in Storage usage breakdown in Settings are all helpful for spotting runaway folders.
- Stay on top of optional updates — the June 2026 optional update contained this fix weeks before it became mandatory. Opting into optional updates earlier would have prevented the worst of the storage drain for many users.
- Maintain at least 15% free space on your system drive at all times — Windows reserves this headroom for update staging, virtual memory, and system restore points.
Do You Need a Fresh Windows 11 Licence?
If this Windows storage issue pushed your machine over the edge — or if you’ve been running an unactivated or second-hand copy of Windows 11 that’s never been properly maintained — it may be worth starting fresh with a fully legitimate licence. Buy Now Key offers genuine Windows 11 Pro licences from €17.90, giving you a clean, activated installation with full access to Windows Update and all security patches from day one. For users who want both an operating system and productivity suite in one bundle, the Windows 11 Pro and Office 2024 Professional Plus bundle is available from €27.80 — a significant saving over buying each licence separately at retail prices.
A properly licensed and freshly installed Windows 11 also means you avoid the accumulated update baggage that can sometimes contribute to bugs like the Windows storage issue discussed here. It’s a clean slate, and Buy Now Key’s 24/7 customer support and money-back guarantee on activation mean there’s no risk in making the switch.
Frequently Asked Questions
What is causing the Windows 11 storage bug?
The bug is linked to the Capability Access Manager (CAM), a Windows 11 subsystem that logs app permission requests for camera, microphone, and location. A recent cumulative update caused its log files to grow without limit, consuming up to 500GB or more on affected machines. Microsoft confirmed the issue in July 2026.
How do I know if I’m affected by this Windows 11 disk space problem?
The clearest sign is unexplained disk space loss — your drive steadily fills up even after you delete files. Use the built-in Storage tool in Windows Settings or a third-party tool like WinDirStat to identify unusually large system folders. If a hidden system folder is consuming tens or hundreds of gigabytes you cannot account for, you are likely affected.
Is there a safe Windows 11 storage fix I can apply right now?
Yes. Install the optional June 2026 cumulative update via Settings > Windows Update > Check for updates. This contains Microsoft’s official fix. If your update channel has not yet offered it, the mandatory Patch Tuesday release on 14 July 2026 will deliver it automatically. Avoid manually deleting system folders unless you have a restore point and have followed verified guidance.
Will this bug come back after the fix?
Once the July 2026 patch is applied, the root cause in the CAM logging mechanism is corrected and the folder will no longer grow unbounded. Enabling Storage Sense and performing periodic disk audits adds an extra safety net for catching any future anomalies early.
Does this Windows storage issue affect Windows 10 as well?
As of the reports available in early July 2026, the confirmed cases are concentrated on Windows 11 builds (24H2 and 23H2). Windows 10 has not been identified as carrying the same CAM logging fault. However, Windows 10 reaches end of life in October 2025, so upgrading to a supported version of Windows 11 remains the best long-term strategy for security and stability.