Toshiba today announced two additions to its 5,400 RPM line of 2.5-inch HDDs featuring industry-leading storage capacities.

In the standard 9.5 millimeter-high, two-platter design, the MK7559GSXP HDD incorporates both the industry's highest areal density and capacity at 750GB. Sample shipments will start from April, 2010, Toshiba said.

The MK7559GSXP HDD features an areal density of 839.1M bit/mm2, making it ideal for mobile applications in which capacity is key, including notebook computers and external HDDs.

Toshiba also introduced a new three-platter 12.5-millimeter-high platform with the MK1059GSM and a capacity of 1TB of storage. This capacity point was predominantly supported by larger form factor 3.5-inch HDDs until the introduction of high-end 2.5-inch solutions.

To deliver these storage capabilities, Toshiba has implemented Advanced Sector Format Technology, which uses 4K byte-per-sector formatting and improved error correcting code functions to provide maximum error detection and more efficient use of the storage surface area.

The MK7559GSXP energy consumption efficiency is about 14% less than the previous generation (MK6465GSX, 640GB).

The new products offerings represent the company's first mobile HDD platforms developed with the combined engineering resources from the integration of Fujitsu's HDD business, which Toshiba acquired last fall.