If you know the answer to this question, you are old

Do you know the answer to the following question on Super User [via Terminally Incoherent]? If so, consider yourself old.
What are the Windows A: and B: drives used for?
To my credit, it took me a moment to remember the answer. A follow-up comment is funny, too:
And as an added bonus, you now know what the “Save” icon represents in your favorite program!