Here another option: it's also possible to copy and leave your map gmap folder in any other path in any HD.
It will be enough to create a shortcut in C\ProgramData\Garmin\Maps\....( Vista>>W7>>W8 path)
This is valid for any HD even for removable ones
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To create a Shortcut to a File or Folder in Windows 7
Open the drive or folder containing the file or folder in which you want to create a shortcut.
Right-click the file or folder, and then click Create shortcut.
To change the shortcut’s name, right-click the shortcut, click Rename from the shortcut menu, type a new name, and then press Enter.
Drag the shortcut to the desired location.

Bye,bye