Windows Defender Bug Fills Windows 10 Boot Drive With Thousands Of Files
A Windows Defender bug creates thousands of small files that waste gigabytes of storage space on Windows 10 hard drives.
The bug started with Windows Defender antivirus engine 1.1.18100.5 and will cause the C:\ProgramData\Microsoft\Windows Defender\Scans\History\Store folder to be filled up with thousands of files with names that appear to be MD5 hashes.
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From a system seen by BleepingComputer, the created files range in size from 600 bytes to a little over 1KB.
While the system we looked at only had approximately 1MB of files, other Windows 10 users report that their systems have been filled up with hundreds of thousands of files, which in one case, used up 30GB of storage space.
On smaller SSD system drives (C:), this can be a considerable amount of storage space to waste on unnecessary files.
According to Deskmodder, who first reported on this issue, the bug has now been fixed in the latest Windows Defender engine, version 1.1.18100.6.
Windows 10 users can check their Windows Defender version by going to Windows Security, clicking on the Settings cog icon in the bottom left of the screen, and then selecting About.
If your Engine Version shows a number lower than 1.1.18100.6, you should go into Windows Update and click on the ‘Check for updates‘ button to download the latest “Security Intelligence Update for Microsoft Defender Antivirus” update.
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If this update is available, Windows Update will automatically install it and not require a restart of Windows 10.
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