You can assign one and only one letter to a volume. For all but the following volumes, you can change or remove the drive letter at any time:
• The system volume
• Any volume on which the page (swap) file is stored
To change a drive-letter assignment, right-click the volume in Disk Management and choose Change Drive Letter And Paths . (You can do this in either the graphical or tabular pane.) To replace an existing drive letter, select it and click Change . To assign a drive letter to a volume that currently has none, click Add. Select an available drive letter from the Assign The Following Drive Letter list, and then click OK twice.
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