6 YEARS?? You HAVE been lucky
I havent had a Seagate drive that EVER lasted more than 3 years working; a 2 year old warranty replacement for another dead Seagate is dying right now in my rig.
(I am copying the data onto a new 3TB Toshiba right now).
Luckily I didnt pay for it, I got it for free; because I stopped buying them not long after XP came out.
I have IBM, WD, and Hitachi drives still going from machines that shipped with Win98se, and I have thrown away even older drives because sub 1GB is useless these days, but all were still working when they left for Silicon Heaven.