USB flash drive(s) not showing in File Explorer

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  1. Ztruker's Avatar
    Posts : 13,511
    Windows 10 Pro X64 20H4 19042.746
       #1

    USB flash drive(s) not showing in File Explorer


    I believe this started with the 720 (1909 18363.720) Windows Update but I'm not sure. I'm going to try backing out the latest WU in a bit but wanted to post the problem here before doing so.

    File Explorer is not seeing any USB Flash drive or mounted ISO, but I can look at them if I enter the drive letter directly in File explore:


    I have a Win10XPE Rescue flash drive inserted and it has been assigned drive I:
    Code:
    C:\Users\ztruk>diskpart
    
    Microsoft DiskPart version 10.0.18362.1
    
    Copyright (C) Microsoft Corporation.
    On computer: DESKTOP
    
    DISKPART> list disk
    
      Disk ###  Status         Size     Free     Dyn  Gpt
      --------  -------------  -------  -------  ---  ---
      Disk 0    Online          931 GB  1024 KB        *
      Disk 1    Online         1863 GB  2048 KB        *
      Disk 2    Online         1863 GB    16 MB
      Disk 3    No Media           0 B      0 B
      Disk 4    No Media           0 B      0 B
      Disk 5    No Media           0 B      0 B
      Disk 6    Online           14 GB      0 B
    
    DISKPART> sel disk 6
    
    Disk 6 is now the selected disk.
    
    DISKPART> detail disk
    
    PNY USB 2.0 FD USB Device
    Disk ID: 07B246EE
    Type   : USB
    Status : Online
    Path   : 0
    Target : 0
    LUN ID : 0
    Location Path : UNAVAILABLE
    Current Read-only State : No
    Read-only  : No
    Boot Disk  : No
    Pagefile Disk  : No
    Hibernation File Disk  : No
    Crashdump Disk  : No
    Clustered Disk  : No
    
      Volume ###  Ltr  Label        Fs     Type        Size     Status     Info
      ----------  ---  -----------  -----  ----------  -------  ---------  --------
      Volume 12    I   MACRIUM_PE   FAT32  Removable     14 GB  Healthy
    
    DISKPART>
    File Explorer doesn't see it.

    USB flash drive(s) not showing in File Explorer-usb-1.jpg

    If I enter I: directly in File Explorer address area it shows correctly:

    USB flash drive(s) not showing in File Explorer-usb-2.jpg
      My Computers

  2. Ztruker's Avatar
    Posts : 13,511
    Windows 10 Pro X64 20H4 19042.746
    Thread Starter
       #2

    I believe one of these two updates caused this:

    USB flash drive(s) not showing in File Explorer-image.png

    Will back them out one at a time starting with the newer one and see what happens.
      My Computers

  3. Ztruker's Avatar
    Posts : 13,511
    Windows 10 Pro X64 20H4 19042.746
    Thread Starter
       #3

    Looks like it was a couple of my flash drives, but that doesn't explain why I had the same problem when I mounted a Win 10 ISO. I ended up doing a repair install and that didn't really make any difference so I tried several different flash drives and they showed up correctly in File Explorer.
    I'm going to play with this some more but for now it looks like specific flash drive unless I can find specific ISO files that exhibit the same problem (again).

    Solved for now.
      My Computers

  4. Ztruker's Avatar
    Posts : 13,511
    Windows 10 Pro X64 20H4 19042.746
    Thread Starter
       #4

    Problem is still there when I mount a Windows 10 ISO.

    USB flash drive(s) not showing in File Explorer-mountnoshow1.jpg

    USB flash drive(s) not showing in File Explorer-mountnoshow2.jpg

    I did a Repair Install but it made no difference.

    Ran DISM and SFC, no problems, no fixes.

    I'll try a new and different account, see what that does.

    Edit: New account made no difference. Booting to Safe mode made no difference.

    Why does File Explorer say DVD Drive? Is that how Mount has always worked?
    Last edited by Ztruker; 19 Mar 2020 at 21:18.
      My Computers

  5. Berton's Avatar
    Posts : 10,511
    Win10 Pro Versions 2004 and 2009/20H2, Win10 Pro IP_Dev, Win10 Home 1909
       #5

    Why does File Explorer say DVD Drive? Is that how Mount has always worked?
    Always has for me. It also has Eject on the right-click context menu.
      My Computers

  6. Ztruker's Avatar
    Posts : 13,511
    Windows 10 Pro X64 20H4 19042.746
    Thread Starter
       #6

    Just tried Windows repair All-In-One, no help. Still the same. This is annoying but not enough to do a Clean Install for yet.

    Any other ideas gratefully accepted.
      My Computers

  7. Pejole2165's Avatar
    Posts : 747
    Windows 10 Pro 1909
       #7

    Windows 10 Pro, 1909 build 18363.720, not seeing this issue myself, however I had a problem with a flash drive showing files I had deleted as if they were still on the drive, went into Device Manager, show hidden devices and uninstalled all greyed out drives under disk drives and storage volumes which has done the trick for that issue.
    USB flash drive(s) not showing in File Explorer-desk01.png
      My Computer

  8. Try3's Avatar
    Posts : 7,427
    Windows 10 Home x64 Version 20H2 Build 19042.868
       #8

    Do you perhaps have some old drive mappings / drive letter assignments interfering with showing these drives?

    The relevant Registry key is
    HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices
    and you should be able to go to, for example, its
    \DosDevices\I:
    entry and just delete it.
    [Personally, I'd at least Export the Key in .reg format before starting]

    Denis
      My Computer

  9. Ztruker's Avatar
    Posts : 13,511
    Windows 10 Pro X64 20H4 19042.746
    Thread Starter
       #9

    I deleted \DosDevices\I: and several others. Restarted, no help. Still same problem.

    Now when I mount the ISO it gets the N: drive but still doesn't show in This PC, same as I: did previously.

    USB flash drive(s) not showing in File Explorer-image.png
      My Computers

  10. Pejole2165's Avatar
    Posts : 747
    Windows 10 Pro 1909
       #10

    Check the group policy editor, see if for whatever reason USB and ISO have been hidden or set to not show. Don't see why that should have happened but worth checking.
      My Computer


 
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