Windows 10: USB Flash Drives not mounting.

USB Flash Drives are being assigned drive letters but not mounting and can't be seen in Windows File Explorer. Here is log for the drive.Log Name: Microsoft-Windows-Kernel-PnP/ConfigurationSource: Microsoft-Windows-Kernel-PnP Date: 8/10/2021 11:33:56 AM Event ID: 442 Task Category: None Level: Warning Keywords: User: SYSTEM Computer: Laptop-K04US Description: Device SWD\WPDBUSENUM\_??_USBSTOR#Disk&Ven_LEXAR&Prod_JUMPDRIVE&Rev_1000#106A6810170407230805&0#{53f56307-b6bf-11d0-94f2-00a0c91efb8b} was not migrated due to partial o

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Failed Media Creation Tool attempt at bootable USB flash drive

Shawn, these are the steps being referred to that NavyLCDR posted. They work for both UEFI and MBR.

Here are the steps to create a standard Windows 10 USB flash drive:

1. Use the Media Creation Tool to download and save the ISO file to your hard drive.
2. Insert the USB flash drive.
3. Open a Administrator Command Prompt and enter: diskpart (if it isn't an administrator command prompt, it will ask for administrator permission).
4. list disk
5. select disk # <- replace # with the actual disk number of the USB flash drive
6. clean <- this will erase the disk selected above, make sure you selected the USB flash drive!
7. create part pri
8. format fs=fat32 quick
9. active
10. exit
11. exit - and if the first Command Prompt was not an Administrator Command Prompt, exit that one too.
11. Mount the ISO file saved by the Media Creation Tool. If you are using Windows 8 or 10, you only have to right click on it and click on mount. If you are using Windows 7, then you must use a program like WinCDEmu to mount the ISO file:
WinCDEmu - the easiest way to mount an ISO. And more...
12. Copy all the files and folders from the mounted ISO file to the USB flash drive.

That's as simple as it gets. Between steps 7 and 8 you can enter: "select part 1" without quotes - but it should not be necessary.
Between steps 8 and 9 you can enter: "assign" without quotes - but it should not be necessary.

 

install.wim is 7GB, how to make a bootable USB flash drive

This is a method to make a ntfs flash drive.

The trial and error step will be booting using Legacy BIOS...

Code:

This is the link:
Guide: How to Format USB Flash Drive Using Cmd - EaseUS

The link did not use active so that is why it is a trial and error step.

 

USB Flash drive made bootable

Hi Nelson,

Check if there is any slide switch on the side that provides write protection. It show's a closed and open lock on each side. We suggest to follow these steps below:

• Insert the USB flash drive into the USB port.
• Click Start, type devmgmt.msc in the Search textbox and press Enter.
• Find Disk Drives and expand it.
• Find the USB flash drive you want to format, and double-click it. It opens the
  Properties dialog box.
• Click Policies tab.
• By default, the Optimize for quick removal option selected, switch it to Optimize for performance and then press
  OK.
• Now open Computer. Right click on the USB Flash Drive and select Format. The Format dialog box now appears.
• Select NTFS in the File System field.
• Press Start and wait while the process will be completed.

You can also connect the USB drive on a different computer and try formatting.

Let us know how it goes.