Drive Letter - Add, Change, or Remove in Windows

1. Press the Windows + R keys to open the Run dialog, type compmgmt.msc OR diskmgmt.msc, and press Enter.

2. If prompted by UAC, then click on Yes.

3. In the left pane of Computer Management, click/tap on Disk Management under Storage. (see screenshots below)




4. Do step 5, 6, or 7 for what you would like to do.

5. To Change a Drive Letter
NOTE: You cannot change a drive letter if the drive is either a system partition or a boot partition, like the partition or drive that Windows 7 is installed on. If you get an error, the partition or drive you are trying to change might be in use. Close any program or window that is using the partition or drive and try again.
A) Right click on a listed drive, partition, or volume letter that you want to change the drive letter of, and click on Change Drive Letter and Paths. (see screenshot below)

B) Click/tap on the Change button. (see screenshot below)

C) Select (dot) Assign the following drive letter, then select an available drive letter from the drop down box, and click/tap on OK. (see screenshot below)

D) Click/tap on Yes to confirm changing the drive letter. (see screenshot below)

E) If you get a AutoPlay pop-up window afterwards, then you can just close this. It indicates that the drive, partition, or volume has been assigned the drive letter. (see screenshot below)

F) Go to step 8.
6. To Add a Drive Letter
NOTE: This is to assign a drive letter to a drive, partition, or volume if a drive letter has been removed or does not already have one assigned to it.
A) Right click on a listed drive, partition, or volume that does not have a driver letter that you want to add one to, and click/tap on Change Drive Letter and Paths. (see screenshot below step 5A)

B) Click/tap on the Add button. (see screenshot below)

C) Select (dot) Assign the following drive letter, then select an available drive letter from the drop down box, and click/tap on OK. (see screenshot below)

D) Go to step 8.
7. To Remove a Drive Letter
NOTE: This will only remove the drive letter and not the drive, partition, or volume. This can be useful if you are getting a low disk space warning for this drive letter.
A) Right click on a listed drive, partition, or volume letter that you want to remove the drive letter of, and click/tap on Change Drive Letter and Paths.

B) Click/tap on the Remove button. (see screenshot below)

C) Click/tap on Yes to confirm removing the drive letter. (see screenshot below)

8. Close the Computer Management or Disk Management window.

9. Open the Computer window to confirm the changes.




1. Press the Windows + R keys to open the Run dialog, type regedit in the search box, and press Enter.

2. If prompted by UAC, then click on Yes.

3. In regedit, navigate to the location below, and do step 4 or 5 below for what you would like to do.. (see screenshot below)
HKEY_LOCAL_MACHINE\SYSTEM\MountedDevices


4. To Change a Drive Letter
WARNING: Do not change the C: drive letter.
A) Right click on a listed /DosDevices\(drive letter) (Ex: /DosDevices\D: ) that you want to change the drive letter of, then click on Rename. (see screenshot above)

B) Rename it with a drive letter that you want to use, and is not already listed here, and press enter. (see screenshot above)
For Example: If I wanted to change it from D: to K: , then I would rename it to /DosDevices\K: instead.
5. To Remove a Drive Letter
WARNING: Do not remove the C: drive letter.
A) Right click on a listed /DosDevices\(drive letter) (Ex: /DosDevices\D: ) that you want to remove the drive letter of, then click on Delete. (see screenshot above)

B) Click/tap on Yes to confirm the deletion. (see screenshot below)

6. Close regedit.

7. Log off and log on, or restart the computer to apply the changes.




1. Open either an elevated command prompt in Windows 7 or Windows 8, or a command prompt at boot for Windows 7 or Windows 8.
NOTE: Changing the drive letter at boot will not always result in having the same drive letter in Windows. Changing the drive letter while in Windows is preferred.

2. In the command prompt, type diskpart and press Enter. (see screenshot below step 6)

3. In the command prompt, type list volume and press Enter. (see screenshot below step 6)
NOTE: Make note of what the volume # is for the drive label/size that you wanted to add or change the drive letter of.

4. In the command prompt, type select volume # and press Enter. (see screenshot below step 6)
NOTE: Substitute # in the command with the volume number from step 3 that you wanted to add or change the drive letter of.
For example: If I wanted to add or change the drive letter of my listed volume 1 for my I: System Back drive, I would type the command below exactly and press Enter.
select volume 1
5. Do step 6 or 7 below for what you would like to do.

6. To Add or Change a Drive Letter
A) In the command prompt, type assign letter=letter and press Enter, and go to step 8 below. (see screenshot below)
NOTE: Substitute the second letter in the command with the drive letter that you wanted to add or change the drive from step 4 to.
For example: If I wanted to add or change the drive letter of my listed volume 1 for my I: System Back drive from I to E, I would type the command below exactly and press Enter.
assign letter=E

7. To Remove a Drive Letter
A) In the command prompt, type remove letter=letter and press Enter, and go to step 8 below.
NOTE: Substitute the second letter in the command with the drive letter that you wanted to remove the drive from step 4.
For example: If I wanted to remove the drive letter of my listed volume 1 for my I: System Back drive, I would type the command below exactly and press Enter.
remove letter=E
8. When successful, you're done. Close the elevated command prompt, or close the command prompt at boot and restart the computer.
That's it,
Shawn