HA! just stumbled upon this thread, and before reading the whole way through, my first question was going to be "Seagate drive?"
My Personal experience with Seagate Drives (both 1TB external) have been abysmal.
After i bought a WD Caviar Green 1TB, and a cheap enclosure (Drive still running like a champ,coming up on 5 years later), my buddy got an off-the-shelf seagate 1TB, and it completely failed with in a year.
a while later, I picked up another seagate external 1TB(Different model) on a black friday deal. the "Click of Death" was present the Instant i fired that drive up for the first time. replaced it with another 1TB WD Green Drive, and moved them both to internal.
My boot drive, a 320GB Hitachi(only about 80GB used), is in it's 3rd computer since 2007ish, all 3 computers have run nearly 24/7. tried to replace it w/a Monster branded 120GB SSD, which when it worked, WAS blazing fast, but within 48 hrs, had file errors left and right.
this Hitachi has been rock solid, and i've yet to have a WD drive fail on me, going back to...92...and my old gateway 2000 PC, with an intel 486sx, running @ 25 Mhz.