How to isolate a Standard User in Windows 11 with specific drive restrictions and a 10GB disk quota?

I need to share my personal Windows 11 laptop with peers for basic tasks (web browsing, MS Word, light coding). I have created a Standard User account, but I am struggling with two specific requirements:

  1. Privacy: I want to completely block this user from accessing my D: drive and specific folders on C:. I tried denying access to “Authenticated Users,” but this locked my Administrator account out as well.

  2. Storage Limitation: I want to limit this user to exactly 10GB of space on the SSD so they don’t clutter my drive.

Is there a way to use NTFS permissions to target only this specific user without affecting my own access, and what is the best way to enforce a hard storage limit for them?

I followed this step ,

  1. Right-click your D: Drive -> Properties -> Security tab.

  2. Click Edit, then click Add.

  3. Type the name of the Guest account you created and click OK.

  4. Highlight that Guest user in the list and check the Deny box for “Full Control”.

  5. Click Apply. Windows will warn you about Deny entries; click Yes.

  6. Result: You (Admin) still have access because you aren’t that specific user, but they are hard-blocked.

but it didn’t show the user added here

Security permissions

windows version