plenty of what ifs
Sounds like WD put a tasty press release out there in response to Seagate's published results, I bet Seagate already have the right answer in their back pocket!
Western Digital has pipped Seagate in the small form factor (SFF) areal density hard disk drive stakes with today's 1TB Scorpio Blue, which, in My Passport Essential SE form, compares to Seagate's 640GB FreeAgent Go. However the Seagate product is a two-platter one, meaning 320GB/platter, whereas WD's has three. That means …
... but only if you can keep it up for long periods of time. I'd like to see reliability get significant improvements, especially from Seagate. Having sent four drives to Seagate for warranty replacement recently (one was a replacement drive from them) I really wish they'd take a lesson.