Change, add, or remove a drive letter
You must be logged on as an administrator to perform these steps.
Windows typically assigns a letter of the alphabet to most drives. If you want to organize your drives in a certain way, you can change the drive letter.
You can assign any letter to a drive as long as long as the letter isn't already in use by a different drive.
To see which drive letters are in use
To change, add, or remove a drive letter
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Open Computer Management by clicking the Start button 
, clicking Control Panel, clicking System and Security, clicking Administrative Tools, and then double-clicking Computer Management.
If you're prompted for an administrator password or confirmation, type the password or provide confirmation.
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In the left pane, click Disk Management.
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Right-click the drive that you want to change, and then click Change Drive Letter and Paths.
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Do one of the following:
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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.
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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.
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To remove a drive letter, click Remove, and then click Yes to confirm that you want to remove it.
Notes
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Some programs make references to specific drive letters. If you change a drive letter, these programs might not work correctly.
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If you get an error, the drive you are trying to change might be in use. Close any program or window that is using the drive and try again.
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You can't change a drive letter if the drive is either a system partition or a boot partition. For more information, see What are system partitions and boot partitions?
