There should be some important files in your USB flash drive.
Or perhaps, the drive is OK but the files in it are damaged.
Access is denied when accessing a hard drive or a folder in Windows 11/10/8/7?
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This post shows you some feasible ways to fix it.
Do you know how to eject USB from Windows?
If you dont know, here are some methods.

How to Eject Flash Drive from Windows?
you might just remove a USB flash drive by some clicks in Taskbar.
Move the icon to the USB disk icon.

Then you’re able to see a message sayingSafely Remove Hardware and Eject Media.
- smack the USB disk icon and then selectEject Ultra USB 3.0from the pop-up menu.
Your USB drive will be safely removed from your Windows computer.
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Method 2: Use This PC
The USB drive can also be displayed in This PC.
it’s possible for you to also access This PC to remove a flash drive from your setup.
Here is how to remove a flash drive using this method.

Your USB drive will be safely removed from your rig.
it’s crucial that you enable Quick Removal in advance.
Here is how to enable it:
These are the three guides on how to eject USB from Windows.
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you might pick the one you want to use to do this job.
Is it necessary to eject a USB drive properly from Mac?
The short answer is probably not.
But, there are still some risks which are mentioned in this post.
Tip: How to Recover Data from a USB Flash Drive?
This software has a trial edition.
If yes, it’s possible for you to use a full edition to recover them without limitations.