Windows Defender is an anti-malware system that is used to identify malware on a Windows system.
With Windows Defender enabled, it will detect, remove, or quarantine malware on your gear.
Why does Windows set up like this?
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However, this feature is disabled in recent Windows versions.
Microsoft did not make a clear statement on this to explain the reason.
Are Windows Defender exclusions not working?

This article offers you several useful tips to help you fix it.
PressWindows + Rkey combinations to open Run.
Typeregeditin the input box and pressEnter.

Then clickYesin the pop-upUAC window.
In the left panel, right-clickWindows Defenderto selectNew>Key.
Change the created keys name toScan.
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Step 6. choose the new key Scan.
Then in the right panel, right-click any blank space to chooseNew>DWORD (32-bit) Value.
After that, rename the new DWORD toDisableRemovableDriveScanning.

Double-hit the created DWORD and set its value to0.
After that, clickOKto secure your changes.
Now Windows Defender is enabled to scan your USB drives automatically.

How to delete duplicate files on a USB flash drive?
What if important USB files are deleted by mistake?
Read this post to find out the answers.
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PressWindows + Rkey combinations.
Then typegpedit.mscin the input box and pressEnter.
In the right panel, double-grab the folder ofScan.

Then find and double-clickScan removable drives.
This feature is not configured by default.
In the new scan removable drives window, selectEnabledand clickApply.
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Now the Windows Defender is configured to scan USB flash drives for viruses.
How to stop Windows Defender from scanning external drives?
You just need to restore Scan removable drives toNot ConfiguredorDisabled.
The USB drive keeps showing deleted files?
This post shows you how to address this issue and how to delete files from flash drives permanently.
However, as said before, doing this may cause USB file loss.
Here I want to introduce a piece offree data recovery softwareto help yourecover Windows Defender deleted filesfrom USB drives.
from internal hard drives, external hard drives, USB flash drives, CDs/DVDs, and other storage devices.
It can help to recover files in various data loss and file recovery situations.
Tip:MiniTool Power Data Recovery Free allows you to recover 1 GB of files without paying a penny.
To recover unlimited files, you better choose a registered edition, such asMiniTool Power Data Recovery Personal Ultimate.
Are your files get deleted when left-clicking?