Cho v. Seagate Technology (US) Holdings, Inc.
If you bought a Seagate hard drive at retail between 3/22/01 and 9/26/07 you can go to this site to see the class action settlement against Seagate. The gist is that they advertised hard drive space in gigabytes measured as one billion bytes instead of using the binary definition of 2 to the 30th power (like operating systems use) which resulted in their drives being sold as having 7% more usable space than they really did.
The upshot is that Seagate is paying out 5% of your purchase price as cash for drives bought in that time frame. Check out the site for all the gory details.