How to mount removable storage devices in Windows 10
Follow these steps to make your removable storage drive a permanent drive in Windows 10. one . In the Windows 10 search box, type and click Create and format disk partitions
2. Find the drive of your removable storage device.
3. Right-click on the drive in your removable storage and select Change drive letter and paths.
4. Browse to your NFTS removable storage folder and click OK.
Applies to all versions of Windows 10
The ability to use a microSD card as a permanent storage solution in Windows 10 for when the base storage of your Windows 10 PC is full can be a useful solution if you need more storage The ability to add additional storage to your Windows 10 PC to store your documents, images and videos allows you to use your PC's main storage for applications and games. An advantage of the Microsoft Surface line is that everyone has an available MicroSD card slot (Surface Book 2 has a full SD card slot) to add additional storage space.
Even if your Windows 10 PC does not have a MicroSD card or full SD card slot, you can also add additional storage through a USB drive or use cloud storage services such as OneDrive. However, cloud storage services do not usually work well as a permanent storage solution in Windows 10. USB drives and microSD cards are better storage options because they do not require Internet access to synchronize.
First, you must format your removable storage device to act as a permanent drive in Windows 10. Warning: This step will erase all files in the removable storage. Be sure to make a backup before performing this step.
1. Insert your removable storage on your Windows 10 PC.
2. Format your removable storage on NTFS.
Next, you must create a new folder on your main drive in Windows 10.
1. Open File Explorer (keyboard shortcut Windows key + E)
2. Right click and create a new folder on your main unit. Name the folder as you want. In this case, I called the new folder, "SD Card".
Next, you must mount the drive formatted in Windows 10.  1. In the Windows 10 search box, type and click in " Create and format disk partitions ".
2. The Disk Management window will open. Find the drive of your removable storage device. Tip: Your removable storage device will appear as " Removable ".
3. Right-click on the drive of your removable storage and select " Change the drive letter and paths .. ".
4. Choose Add and choose the new folder you created.
5. Click OK .
6. Close the Disk Management window.
If you want to verify that your removable storage device has been mounted correctly, follow these steps:
1. Open File Explorer
2. Go to the folder you created on your main drive.
3. You should see the folder on your drive, but it is no longer represented by a folder icon. If you right-click on the folder and go to Properties you should find information similar to this:
When When you enter the folder, you will see that it is inside your removable storage device, instead of having a different volume path, it is now mounted on your main unit. Now, you can set the path for any new software, application or file to the folder you just mounted on your main unit.
Here are Amazon's links to the SanDisk SD card and BaseQi microSD drive support for my Surface Book 2 I used for this tutorial.
SanDisk 200GB Ultra microSDXC UHS-I memory card with adapter
BASEQI MicroSD aluminum adapter for Microsoft Surface Book 2 15 ″
More information: Microsoft, OneDrive, Storage, Surface Book 2, Windows 10, Windows Settings