Seagate support gave this reply:
The 6PT0SS37 (model ST3160023AS) was purchased in December. Granted, I can't be sure when the older drive was purchased, but I do remember buying it for the 5 year warranty. I am quite troubled that my brand new drive will appear to be out of warranty in just over a year. Seagate's solution requires that I open my system and attach a receipt to every drive I have installed, including the 30+ drives in several RAID arrays. I hope that the receipt doesn't get sucked into a cooling fan.With regards to your query, we would like to inform you that all internal drives that are shipped out of Seagate on or after 01 JUNE 2004 will be covered under 5 year warranty and as you have mentioned that you have purchased the drive with the serial number 3KA14P5V in 2003, the drive is not covered under 5 year warranty and for the unit with the serial number 6PT0SS37, Seagate will definitely honor 5 year warranty, please preserve the proof of purchase and provide the same when you require warranty replacement.
We apologize for the inconvenience caused.
See Seagate warranty validation site"