Western Digital is bringing out a second version of its latest 150GB Raptor drive next month, the company said today at CES in Las Vegas.

Raptors may not have the biggest capacities on the market but they have the fastest spin speeds - 10,000 RPM compared to the more typical 7,200. Combined with its 16MB cache, this gives the drive very fast seek times.

A solid top version is already on the market, and today the company showed off a clear top version, so that you can see the platters spinning. It's aimed at hard core enthusiasts with see-through cases, and the company is working with case manufacturers to see more hit the market.

Even so, it's going to be of limited appeal - few people will care that they can see the platters spin, but it will attract a very niche market.