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If you are using a device with Microsoft's Windows 10 operating system and Windows Defender as the default security solution, you may be impacted by a bug that is filling the hard drive with files.
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Windows Defender puts thousands of files in the folder C:\ProgramData\Microsoft\Windows Defender\Scans\History\Store if a device is affected by the issue. More than 10,800 items were placed in the folder on a test system running Windows 10 version 20H2. Other users reported over 950,000 files over the course of a 24 hour period and 30 Gigabytes of storage occupied by the files. Most files are small in size, between 1 and 2 Kilobytes.
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I had 816 files in there using about 5MB. I just manually deleted all of it.
It's another reason that Nukecad and I noted in a topic from awhile ago why having Defender cleaners in winapp2.ini can be beneficial to removing allot of accumulation it builds up - but that particular folder isn't cleaned by any winapp2.ini entries to my knowledge.
Edit:
I'm submitting that folder location to winapp2.ini.
i have defender never used and nevertheless saved it some files in this folder. but only a few with 700 - 800 kb. some from 2015, 2016 and 2018. (w8.1)
If you cannot get the update for the Defender fix through Win Updates (keeps saying there was a problem and to retry) instead right-click on the Defender taskbar icon and select to update that way.