To change Drive Letters:
Go to Start > Control Panel > Administrative Tools > Computer Management, Disk Management, then right-cl!ck the partition whose name you want to change (cl!ck in the white area just below the word "Volume") and select "change drive letter and paths."
From here you can add, remove or change drive letters and paths to the partition.
From here you can add, remove or change drive letters and paths to the partition.