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After Windows failed to recognize a USB device (a hub) my drive letters got messed up. Because the hub had drives J, K and L connected these letters inadvertently became available, and when I put a USB stick in a different slot it became drive J.
Rebooted to get my J, K and L back. But now they were assigned K, L and M. J is not available when I try to rename K to that. How can I get an unused drive letter back?

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Reset to default
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To change, add, or remove a drive letter

  1. Open Computer Management by clicking the Start button Picture of the Start button, clicking Control Panel, clicking System and Security, clicking Administrative Tools, and then double-clicking Computer Management. Administrator permission required If you're prompted for an administrator password or confirmation, type the password or provide confirmation.

  2. In the left pane, click Disk Management.

  3. Right-click the drive that you want to change, and then click Change Drive Letter and Paths.

  4. Do one of the following:

a. To assign a drive letter if one has not already been assigned, click Add, click the letter that you want to use, and then click OK.

b. To change a drive letter, click Change, click Assign the following drive letter, click the letter that you want to use, and then click OK.

c. To remove a drive letter, click Remove, and then click Yes to confirm that you want to remove it.

http://windows.microsoft.com/en-us/windows/change-add-remove-drive-letter#1TC=windows-7

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    I'm aware of the procedure, it's just that I had overlooked that the J was assigned to an unconnected(!) removable device. Thanks for the answer, anyway.
    – stevenvh
    Mar 20, 2015 at 16:25

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