Hitachi has released details of a new energy-efficient mobile computer hard disk drive.

The 2.5in Travelstar 7K320 offers capacities from 80GB to 320GB, some 60 percent more than its predecessor, the Travelstar 7K200. The 7K320 hard drive, which spins at 7,200rpm, also uses 25 percent less power than the Travelstar 7K200.

According to Larry Sweezey, director of consumer and commercial hard disk drives at Hitachi, the 7K320 can run applications 12 percent faster than the model it is replacing.

The new mobile hard drive costs around £110 and will ship before the end of the month, Hitachi said. Sweezey declined to identify manufacturers who plan to embed the new drive into their systems, although he said those products should debut by early in the third quarter.

The fourth-generation Hitachi device includes a serial ATA interface with data transfer speeds of up to 3 gigabytes per second (GBps), and offers a bulk data encryption security option. The Travelstar 7K320 can store up to 80 hours of high-definition video, 320 hours of standard video, 114 movies and 80,000 four minute MP3 songs.

Sweezey said the mobile hard drive is targeted at laptops, gaming devices, compact desktop systems, small video devices, blade servers and video surveillance systems.

"Desktops went to 7,200rpm a long time ago on 3.5in [drives] but there's always been a big gap between what a desktop hard drive and 2.5in laptop drive can offer around spin speed," said Sweezey.

"We believe there are a lot of folks hungry for performance for systems running very heavy computing and video files."

Read our Hitachi Deskstar 7K1000 1TB hard drive review