Western Digital 2Gig write up

Maximum external transfer rate       300MB/s
Maximum sustained data rate     138MB/s
Average rotational latency     4.2 ms
Spindle speed     7,200 RPM
Cache size     64MB
Platter size     500GB
Areal density     400 Gb/in²
Available capacities     2TB
Idle power     8.2W
Read/write power     10.7W
Idle acoustics     29 dBA
Seek acoustics     30-34 dBA
Warranty length     Five years

for this nice hardware report, and tech images.  Western Digital Black Caviar 1TB drives are a sweet spot right now with cost+tech, but the 2TB look to be a viable solution once their prices drops a bit.

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