You’ve connected a USB flash drive, heard the familiar Windows sound of connection, yet no drive letter shows up. You then go into Disk Management for Windows and see the device and memory, but the USB flash drive doesn’t get assigned a drive letter.

What should you do?

Most of the time, Windows will automatically assign a drive letter to any connected storage device—whether it’s a USB stick, USB hard drive, or other mass storage device.

However, if a drive letter isn’t assigned, there’s a quick fix to get your computer working properly again:

1. Open Command Prompt as Administrator (search for CMD, then right-click and select “Run as Administrator”).
2. Type diskpart and press Enter.
3. Once in DISKPART, type automount enable and press Enter.

If the above steps don’t solve the problem, there could be conflicting registry entries from past USB devices that disabled or interfered with the automount function.

Nexcopy offers a registry cleaning tool specifically designed for USB devices connected to your computer. This utility is an executable file that requires no installation and contains no spyware or malware. Nexcopy is a reputable company that provides direct support via phone, email, or live chat, so you can trust their software is safe and reliable.

USBScrub is the utility name and is available for download here.

We’ve seen these terms floating around in forums and How To’s for years when someone is explaining what to do with USB flash drives. I think most people glaze over the definitions of Clean, Erase and Format simply because they believe the terms are interchangeable, or they aren’t planning on doing the task mentioned in the post.

I hope the following information will clear up some terms and definitions so we can all better understand what people are talking about when passing along information about flash drives and the Clean, Erase and Format function.

All of these functions can be performed in your Windows 10 computer, or higher. I will start with the least complicated definition and task, and move along from there.

Format

This function is what 98% of Windows computer operators will use. This is the graphical interface inside Windows when you right click a drive letter and ask the operating system to format the drive. What is this function really doing?

Format is the least complicated of the tasks, and this function is removing the File Allocation Table of the USB and creating a new one. Said a simpler way… this function takes away the list of files sitting on the drive so it then appears blank with no data.

It’s important to note, the files are still on the drive, just not listed in an easy, organized manor which you can see through windows explorer (clicking on the drive letter to see the list of files).

Using the most basic file recovery software tools, like the one we wrote about several months back, you can recover all the files sitting on the drive.

Maybe a picture will help. Looking at the image below you can see the “data” is light grey. Meaning the data is still there, just not easily accessible. This data is what recovery software will look for, find, and list back on your drive. Also notice the boot code of the USB (if you want to load an operating system on your USB stick) isn’t touched either.

You might have questions if a USB flash drive should be formatted as FAT, FAT32, exFAT or NTFS and we did a great post about that a bit earlier as well.

Clean

The Clean function is a bit more in-depth than the format function. This function applies directly to the Master Boot Record (MBR) or boot code mentioned just above.

The Clean function will clear out boot code and will remove any partition on the flash drive. The partition of a flash drive is the information which tells a host computer how big the drive is, and if the partition should be bootable in the event you are trying to start the computer from a flash drive.

The Clean function is not accessible through the GUI of Windows, for example you cannot right click on a drive letter and find the Clean function. The Clean function is only accessible through the Windows utility called DiskPart.

The link below is for a ZIP file that contains two batch files to either enable or how to disable USB write protection on a Windows 10 computer. These batch files also work on Windows 7 machines.

This solution is ultra-easy and very quick: one click to run the registry edit file and one click to confirm the task. That’s it.

Typically, a person will want to lock down the USB ports of a computer to ensure a virus doesn’t spread through a USB device, such as a flash drive. This batch file provides a fast and simple way to both lock down your USB ports and easily unlock them again.

Important: Do not have a USB flash drive connected to the system when you run either batch file.

For those seeking more technical details, here is the specific registry edit being applied. Changing the DWORD value to 00000001 sets the device policy for the computer to be write-protected. Changing that value back to 00000000 restores normal read/write access.

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\
StorageDevicePolicies]
“WriteProtect”=dword:00000001

Note: This USB write protection method is specific to the PC on which it is applied. It is not device-specific and will not follow the USB drive to other machines.

If you require USB write protection that is permanent on the device itself and universal across all computers, contact Nexcopy.com and ask about their Lock License USB drives. This hardware-level solution is embedded in the USB controller, ensuring the drive is always write-protected, preventing any possibility of a virus being written to the USB stick. This is the best universal solution for USB write protection.

Screenshots of the Batch File Process

Batch files included in the ZIP:

Windows confirmation prompt after running the batch file:

Task completion screen:

Download link for the two batch files:

USB Write Protection Registry Edit Batch Files