Recovering drive letters

[Hapkido]

I'm assuming that my experience is typical in regard to what I'm
asking? I've occasionally changed drive letters, mostly on USB drives, and
noticed that the original drive letter was no longer available after the
change. For example, original letter is "G" and it is changed to "N". Going
back and looking at the list of available letters, "G" is no longer listed.

QUESTION: Is it possible to recover those once used drive letters so
they can be used again? If yes, how is this done?

System is a Vista Ultimate 32-bit.

 

[Hapkido]

Thanks.... great information! :~)