Using the CMD prompt in Windows 10 or 11, it is a one line request to get the serial number of a USB flash drive. The serial number in question is the device serial number which follows the device and will be the same serial number to identify the physical device. This serial number is written into read-only memory on the flash drive and cannot be duplicated or deleted or modified. This is different than the volume serial number which we talk about from a previous post.

Steps are very simple:

# Insert a flash drive (or multiple)

# Select a flash drive by clicking on the drive letter

# In the Explorer path field type cmd

This will open the Command Prompt

# Copy the text below and click Enter

wmic path Win32_USBControllerDevice get Dependent | find “USBSTOR”

This request is asking Windows to search the computer for any Mass Storage devices (flash drives) connected to the computer USB Host Controller on the motherboard.

You do need to parse some information out because more than a serial number is given.

The serial number of the USB flash drive is listed last and there is a &0 at the end which is not part of the serial number. The hardware serial number can range in length so we don’t have a guideline for how long it should be. Typically we see serial number lengths range from 8 to 30 alpha-numeric values.

Using a 3rd party program, you can see the serial number of the USB flash drive matches that of the cmd prompt request.

1. Can you freeze a USB flash drive?
2. Will a USB flash drive survive the washing machine?
3. Can a USB flash drive survive getting wet?
4. How long does a USB flash drive last?
5. Why is a USB flash drive so durable?

#1 – Can you freeze a USB flash drive?

Yes, if a USB drive is frozen it will work and will work immediately without need of defrosting it. Nerdy details below.

#2 – Will a USB flash drive survive the washing machine?

Yes, a USB flash drive will survive a washing machine; however, it is recommended to let the flash drive dry for 24 hours before trying to use it. Nerd details below.

#3 – Can a USB flash drive survive getting wet?

Yes, a USB flash drive will survive getting wet; however, it is recommended to let the flash drive dry for 24 hours before trying to use it. Nerd details below.

#4 – How long does a USB flash drive last?

Data on a USB flash drive could last forever if setup correctly and stored correctly. However the real-world answer depends on a couple things: What type of NAND flash memory? SLC, MLC or TLC and also how the device is stored between now and eternity. The nerd details are below but if you want a USB flash drive to last a realy long time you need to setup the device correct A) write protect it and you can’t leave it out in the elements B) don’t expose it to extreme tempuratures.

#5 – Why is a USB flash drive so durable?

A USB flash drive, or thumb drive, is made up of NAND memory. The unique thing about NAND memory is the ability for it to store data without elelecticty being required to flow through it.

The technical (nerdy) details about the above questions.

A quick recap about traditional storage memory. In very simply terms your computer uses a hard drive and uses RAM. The hard drive (at least the old’en days) uses a magnetic disk to store data. The magnetic platter(s) inside the hard drive hold positive and negative charges. The + and – equal the binary zero and ones – because of the charge state the hard drive could “remember” data without needing power.

A “write protect switch” for a USB drive is meant to turn on and off the ability to write data to the drive. When the USB is locked (read-only) content cannot be added, changed, altered, manipulated, formatted or deleted off the drive. What is the point of a physical write protect switch if anyone can turn the write protection on or off? Doesn’t add up…

Yes, a write protect switch keeps the honest people honest, however the USB write protect switch doesn’t apply in all situations.

So what replaces a write protect switch for a USB flash drive?

How about programmable firmware for turning ON and OFF the USB write protection?

Better yet, how about a required password before turning ON and OFF the USB write protection?

We can relax because the Lock License USB flash drive addresses both these issues of
#1) Replacing the USB write protect switch with a more secure method
#2) Provides the feature of assigning a password to turn on and off the USB write protection.

The Lock License drive is a hardware based ( at the chip level ) write protection solution and through a specific vendor software command the write protection can be removed to make the USB stick writable. The function to write protect the media can be done through a provided GUI software application, can use a command line to change the write protect status, or use the command line to build your own custom method for how the USB write protection can work.

The write protection is configured on the USB controller of the flash drive. This means the write protection is done at the device level and will follow the USB stick. The result is a Lock License drive which is truly read-only when connected to anything… such as a Windows computer, Mac computer, Linux box, Smart TV, car stereo, anything!

The Lock License drive comes with a software method to unlock the drive and make it writable. This special software requires a password to be assigned for the unlocking. The password is required because the manufacturer, Nexcopy, didn’t want a universal way to unlock the drive.

Kanguru manufactures a USB flash drive with a physical write protect switch. The write protection itself is as secure as the Lock License solution, the difference is a Lock License drive adds one additional layer of security. The additional layer of security, the password requirement to make the stick ‘writable’ is an important step for ensuring the device is as secure as possible. To be clear, the Lock License drive is always readable. This product seems a great solution for those who want a USB write protected without the ability for users to turn the write protection off with a flip of a switch.

Another interesting fact about the Lock License drive is the default state of the USB stick being read-only, or write protected. This means it is impossible for a user to accidently leave the Lock License drive unlocked.

The “locking” or write protection is done when power is cut from the device. Even if a user forgets to lock the drive, the locking happens automatically when the USB is disconnected from the computer. This is a major issue with those using a USB write protect switch; if a user forgets to set the write protect switch, well not much security at that point.

It is worth noting there is no universal way to write protect any flash drive, this is why you cannot buy some software solution to do the feature. Write protection is a hardware based solution, not software.

From our on-line research, the Lock License drive is manufactured by Nexcopy Inc who is based out of Southern California. The product is available in USB 2.0 for the smaller 2GB and 4GB and any GB capacity higher (8GB and above) is USB 3.0 technology. The maximum size as of this posting is 256GB media.