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Today a mysterious new drive called "ESP (F:)" appeared on my PC. It is about 500 MB. And when I click on it, I'm told I do not "currently have permission to access this folder".

See bottom right of following image:

enter image description here

Is this just a bug that I needn't be too worried about?

Some others reporting the same thing at another site.

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AKA EFI partition, apparently it was assigned a drive letter, you can remove the drive letter (set it with no drive letter) using Disk Management and it will become hidden in explorer again.

To answer the other question as why you cannot access it see this question

EDIT: Adding the solution from the OP comments, restart the PC several times and it will disappear.

  • It has no letter on Disk management, but it took over my network drive in my computer.... can this partition be removed ? – Dani Aug 14 '16 at 15:39
  • It has to if Explorer shows a drive letter, no I would not remove it. – Moab Aug 14 '16 at 19:58
  • noap. Explorer has a drive letter DM hasn't. needed to boot the computer twice and it was gone..... – Dani Aug 15 '16 at 15:02
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    When in doubt reboot, reboot,reboot! Glad you solved it. – Moab Aug 15 '16 at 16:16
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From my experience this is a temporary partition used during a Windows 10 upgrade. After installation of upgrade and reboot, it should disappear.

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I don't think that deleting this is a good idea, you should let Windows deal with it itself.

You can't do anything with Disk Management, but you can hide it, however, by starting an elevated command prompt and typing

mountvol driveletter: /d

For me, this allowed mapped network drives to be correctly mapped again from the domain.

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