I suggest you click on the link and find out:
Seagate offers fix, free data recovery for bricked Barracudas - The Tech Report
Is your hard drive possibly affected? Check out:
Seagate Knowledge Base
In summary:
If you have any Seagate hard drive purchased in the last few months, BACK UP now before its too late.
EDIT:
Stickying this thread as this is is something that every computer user should know.