Seagate is shipping the Seagate Mobile HDD, the world’s first hard disk drive that squeezes two terabytes into the 7mm, 2.5-inch form factor used by some ultrabooks. Weighing just 3.17 oz., the Mobile HDD is 25 percent lighter than the previous generation of mobile hard drives. A smaller 7mm drive frees up space in a mobile device to accommodate additional designed-in features, such as bigger batteries, more memory and better air circulation.

Utilizing 1TB per disk, the Seagate Mobile HDD is compatible with most of today’s mobile computers and comes with a standard SATA 6Gb/s interface. The drive is available in both 1TB and 2TB capacities.

Seagate competes with Western Digital, the market leader in terms of unit sales, which also ships 2TB drives, but at larger 15mm Z-heights. WD ships a 1TB, 9.5mm mobile hard drive, as well.

Seagate didn’t disclose the price of its new HDD. The company sells its 9mm drive for $140, however, so the newer, thinner 7mm drive will probably cost a little more.