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http://www.mac.com/1/mac_faq.html
Q: I already paid for an iDisk upgrade, what will happen to my account?

If you purchased iDisk storage in the 12 months prior to July
17th, 2002, you will receive a one-year complimentary .Mac
membership. The amount of additional iDisk storage you purchased will be available to you
through the end of the membership.

Note: At the end of your one-year complimentary .Mac
membership the membership and additional iDisk storage will be
automatically renewed for the following year and your credit card
will be charged

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