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1GB? that seems... awful small.

And even 1TB, which is presumably what he meant, feels very small to me.

Massive compared to the 10MB drive in the IBM PC/XT....

The fewer platters the better for vibration and noise as well. Though I wouldn't necessary restrict myself to single-platter drives, 2 platters is generally fine.

It's really unfortunate that WD has completely halted expanding capacity on their Blue line. Meanwhile, my WD6400AAKS (640GB blue, 2 platter) keeps marching on.

Agree. Just bought another 3 yesterday.

At less than $60 each, you can't really beat the price/performance ratio, particularly on a RAID5 environment.

Any particular advantages of having a single platter?

Also, I assume you meant to say 1TB ^^

The logic is that fewer moving parts means a lower failure rate. It amounts to paying a premium for longer-lived drives. How much you value that is a matter of taste and means.