The hard drive GB/$ lure and the cascade issue

I commented earlier last week on Seagate's new 750GB hard drive and suggested a few possible items of data that could be used to fill it up.

Yesterday, MacNN announced the availability of a Firewire based unit using the drive. The price is quoted as $560 - to me, that seems remarkably cheap. That might be because I'm used to buying large drives, but, in fact, a quick couple of calculations show that at this price, you are get ting 1.34GB/$. Compared to other Firewire hard drives, a LaCie 500GB unit comes out at 1.28GB/$ and a 400GB worse at 1.21GB/$. (Those figures are all recommended prices, I've no doubt the actual ones might be a lot lower.)