Seagate is developing a 3TB disk drive which could hit the market this year.

According to people familiar with the company's plans, a 3TB Constellation ES drive with a 6Gbit/s SAS interface will arrive later this year.

The Constellation ES is a replacement for the Barracuda ES and is, Seagate says, an enterprise class drive, currently maxing out at 2TB, and spinning at 7,200rpm. There is a 2.5-inch version which tops out at 500GB capacity.

Our understanding is that a 1TB version of that product will also arrive around the mid-year point, and be the world's highest-capacity 2.5-inch drive, exceeding products offered by Toshiba and Western Digital.

We further believe that a new Savvio 2.5-inch drive is coming, a development of the existing 600GB, 10,000rpm 10K.4 product with more capacity, possibly 750GB. ®