Keep running low on storage and don't know why? Mysterious Windows 11 file that ate tons of drive space is fixed in latest update | Tech Radar

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Keep running low on storage and don't know why? Mysterious Windows 11 file that ate tons of drive space is fixed in latest update

Latest update finally fixes a 'notorious culprit for system bloat'

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Some Windows 11 users have found their drive space has been mysteriously dwindling

In some reported cases, this is down to a database file for a Windows component that grows massively due to an apparent bug

The optional update for June fixes this, albeit that patch is still in testing

If you use Windows 11 and have been wondering why your drive space seems to have been mysteriously dwindling of late, the culprit could be a background process called Capability Access Manager.

Capability Access Manager (CAM) is a rather obscure Windows component which, as the name suggests, manages the apps on your PC in terms of permissions to access the camera, mic and so forth.

CAM keeps a database that logs app requests and this is stored as a file called Capability Access Manager.db-wal – and it's that file which is growing hugely on the drives of some unlucky Windows 11 users.

Neowin reports that Microsoft just implemented the fix for this aggravating issue in the latest update for Windows 11. This is patch KB5095093 which is the optional update for June (so it's still in preview, or testing, at this point).

In the changelog for this release, Microsoft tells us: "This update improves disk space usage for the Capability Access Manager.db-wal file."

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So, with any luck, this will be an end to the gremlin, and those who install the June preview will find this database file has been changed so it doesn't spiral out of control and eat their storage like some kind of log-based black hole.

This is a nasty little problem, especially for those who've got a modest main drive for Windows 11, such as a 256GB SSD (or maybe even smaller). With reports of the database file expanding to a size of 60GB to 100GB, or even larger (200GB according to this Redditor), you can see how problematic this could be when you're already short on space with your SSD.

Microsoft doesn't explicitly say that this is a bug, but surely it must have been? Albeit a situational one that only occurred on certain systems by all accounts (Dell PCs are mentioned in a few reports, I should note). It's clear, however, that there are a lot of reports of CAM woes on Reddit and Microsoft's own help site, with some folks left scratching their heads as to what on earth was going on – and why their drive space was disappearing into some apparent void.

Unfortunately, these problems have been around for some time, with those reports going back to March 2026, and some dating from almost a year ago. As one Redditor explained in a post some 10 months ago: "Turns out it's the 'Capability Access Manager.db-wal' file which ate up 25GB. Looked through some forums and seems like it's a notorious culprit for system bloat. That file is supposed to slowly build up then be emptied each month, but mine bugged and never emptied itself."

There are workarounds to delete the CAM database file and effectively empty it out, but they're somewhat fiddly, and the log will rebuild itself if buggy conditions still abound on your PC. As one Redditor observed: "I spent hours trying to delete that file. Like in a horror movie, it just wouldn't die, even when I thought I had killed it. Your procedure [workaround] worked perfectly. Thanks!"

So, the whole thing has been a bit of a headache really, and while it's good to see an apparent cure now, it's taken Microsoft long enough. And frankly, I'm not impressed with the communication on this issue from the software giant.

To be clear, the fix right now is to download and install the June optional update for Windows 11, but bear in mind that as noted, it's a preview, so there's no guarantee it'll work as it should. The resolution will be provided with the full July update, mind, in tested form, and that's just around the corner – so you might just want to wait for that. Assuming your drive isn't chock-full and causing you a whole load of grief, anyway.

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Darren is a freelancer writing news and features for Tech Radar (and occasionally T3) across a broad range of computing topics including CPUs, GPUs, various other hardware, VPNs, antivirus and more. He has written about tech for the best part of three decades, and writes books in his spare time (his debut novel - 'I Know What You Did Last Supper' - was published by Hachette UK in 2013).

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