You may change the disk's drive letter and other properties on the General tab of the Properties panel
Drive letter: Select a drive letter under which your system will see the encrypted disk. Select Show only available drive letters to let your system select the drive letter itself.
Connect this disk as write protected: Select this check box if you want to connect the encrypted disk as a read-only device. You will be able to read data from the disk but not to write anything to it.
Emulate fixed disk: Select this checkbox if you want that your system sees the disk as a fixed one.
Select Emulate fixed disk only if you plan to share the new disk on Windows XP or later Windows versions.