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How to Encrypt a USB Flash Drive or SD Card with Windows 10

Flash drives and SD cards are a convenient tool for transferring data. However, with the convenience and portability, comes a security risk. That’s where encryption becomes valuable, and BitLocker in Windows 10 makes it easy to do. Plus, Windows 10 version 1151 comes with a new and improved encryption algorithm.

Note: The BitLocker encryption tool is only available in Windows 10 Pro and not the Home version.

Encrypt External USB Flash Drive Windows 10

Plug in your flash drive (you can do this with an SD card, too) and wait while Windows recognizes it. If AutoPlay comes up, select Open folder to view files.

Windows 10 autoplay

From the Ribbon select the drive you want to encrypt. Then from the Ribbon click the Manage tab then BitLocker > Turn on BitLocker.

file explorer

Alternately, you can open This PC, right-click the drive, and select Turn on BitLocker.


Whichever way you do it, the BitLocker wizard starts up. Check Use a password to unlock the drive and type in a password twice.


Next you’ll be prompted to back up a recovery key that is a string of characters that will let you access the drive in case you lose the encryption password.

I recommend saving the recovery key to a file or printing it out and storing it in a secure location rather than having it in the cloud.

recover pw

Now choose how much of the drive to encrypt. You can select only the used space or the entire drive.

encrypt drive full

New Encryption Mode

BitLocker in Windows 10 version 1511 (November Update) now includes the 256-bit XTS-AES encryption mode that provides additional integrity support with the improved algorithm. However, it’s not available on older versions of Windows.

Related Article:  Windows 10 Tip: Enable Desktop Peek from the Taskbar (Updated)

You’ll need to choose which method to use. So, if you only plan on using this drive on the PC you’re encrypting it on; you’ll probably want to use the new encryption mode.

But if you need to use the drive on other PCs that have older versions of Windows (which is probably the case with a flash drive or SD card), select Compatible Mode, which uses the previous 128-bit AES.

new encryption

Now you’re ready to start encrypting the drive.

start encryption

The amount of time it takes to complete will vary depending on your system specs, the amount of data, and the size of the drive.


Now when you plug in the encrypted drive, you’ll be prompted to enter the password you created for it. You can also choose more options and have the drive automatically unlock on this PC or enter the recovery key if you forgot the password.

unlock drive

You’ll know if a drive is encrypted when you open This PC by the lock symbol.

encrypted drive symbol

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4 Responses to How to Encrypt a USB Flash Drive or SD Card with Windows 10

  1. Joseph December 28, 2015 at 11:18 am #

    It is my understanding that Windows 10 home edition does not have BitLocker.

    • Brian Burgess December 28, 2015 at 12:25 pm #

      Correct. It’s only available in Pro versions…we pointed that out as a note at the beginning of this article.

  2. Roger January 2, 2016 at 8:25 am #

    Thanks Brian this is very helpful as I have a vey small hard drive on my new laptop and invested in a 64GB hard drive for all my archive work files, but I want to keep it secure.

  3. Larry Frishman January 3, 2016 at 2:30 pm #

    When my laptop was running 8 or 8.1, a tech encrypted mu laptop using a flash drive that has to be plugged into my USB to run the computer. I don’t know the code and can’t reach the tech. How can I change this? I have Windows 10 pro.

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