Toshiba today announced the 400GB MK4058GSX 2.5 inch Hard-drive.

The MK4058GSX boosts areal density to 477Mbit/mm2 (308Gbpsi) to achieve a capacity of 400GB on just two platters, plus five drives that bring new levels of performance and 7,200rpm rotational speeds to the company’s full range of storage capacities.

MK4058GSX achieves an areal density of 477Mbit/mm2, by the result of improving the read-write head and of an enhanced magnetic layer. With the same two platter design as Toshiba’s current 320GB design, the new model offers a 400GB capacity, the largest yet achieved, while retaining the 9.5mm thickness of its predecessor.

Mass production of the 400GB MK4058GSX will start from September, targeting notebook PC and consumer electronic applications. Mass production of the 7,200rpm drives will start in August. The line-up includes the 320GB MK3254GSY and models with 80, 120, 160 and 250GB capacities.

Toshiba will feature the new drives at DISKCON JAPAN 2008, organized by The International Disk Drive Equipment and Materials Association (IDEMA), which will be held in Tokyo, Japan, from July 22nd to 23rd, and at IFA 2008, one of the world’s largest consumer electronics trade fairs, which will be held in Berlin, Germany, from August 29th to September 3rd.