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Toshiba Corp has announced a line-up of 2.5-inch HDDs, including a low-noise model that 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.

The 400GB MK4058GSX is targeted at notebook PC and consumer electronic applications. It uses an improved read-write head and enhanced magnetic layer to boost areal density to 477Mbit/mm² and achieve a capacity of 400GB on only two platters, which is claimed to be the highest data density of any of company's 2.5-inch HDD. Acoustic noise during data seek has been reduced by 2dB, compared to the company's current 320GB MK3252GSX, making operation almost inaudible. As a result, the 400GB drive is suitable for noise-free playback of movies and music on notebook PCs and digital products.

The five other drives that the company has added to its line-up take full advantage of a 7,200rpm rotation speed to boost performance. Compared to the current 200GB model, the 320GB MK3254GSY improves maximum internal data transfers rate by approximately 14% to support high-speed processing of high volume data. The 320GB drives is also 37% more efficient than the MK2049GSY in terms of energy consumption efficiency. All of the drives, available in a line-up of 80, 120, 160, 250 and 320GB capacities, support an optional free fall sensor function, that detects a falling HDD and parks the head before impact.