LAN-Tech Network Management

Some users are reporting a sudden loss of drive space. It seems a recently released Microsoft Defender update is generating thousands, and even millions, of files consuming many GB of storage space. The folder where these files are located is C:\ProgramData\Microsoft\Windows Defender\Scans\History\Store

You can resolve the issue by “checking for updates” under Update and Security (Windows 10) and installing the latest Microsoft Defender update.