My Seagate drives are dying off one by one, now.
I bought them about 2 years ago, but these are the first drives I have ever had start failing on me. I've always upgraded a drive before it went bad.
When the first drive of my RAID10 array died, I replaced it with a Western Digital 7200rpm RE4, which is a drive built specifically for use in RAID enclosures. It has a 5 year warranty, where most of the new Seagate drives have gone to 1 year warranties. Some Seagate drives are still 3 years, but those are getting harder and harder to find. From now on, I'm going to buy these RE4 drives, or at least the WD Caviar Black 7200rpm drives. They are also warrantied for 5 years, and they are covered for RAID use in desktop computers.
Keep an eye on your warranty terms, too! The Seagate consumer drives aren't covered if you have used them in a RAID enclosure, and may not be covered for RAID use even in a desktop system. This is why I have been paying the little bit extra for the drives that are built for use in RAID arrays. I really hope the extra money pays off in the future.