As per the prior discussion of the box saying 3 years and the online warranty tool saying 1, this straight from Seagate CS:
"With regards to your query, we would like to inform you that, due to some technical error with our QIS database, there are certain warranty discrepancies on Seagate hard drives.
However, if you have purchased the drive independently from an authorized retailers, Seagate would honor the full warranty from your date of purchase, 1 year warranty for external drives and 3 year warranty for internal drives. We suggest you to preserve a copy of your Proof Of Purchase for future reference.
Kindly refer the model number as on the Proof Of Purchase for warranty assistance.
*Please note that the 3-year warranty is applicable ONLY to Internal drives shipped on or after September 12th, 2004.
We apologize for any inconvenience caused.
Regards,
Shannon
Seagate Warranty Support."