Hitachi isn't flaunting the "world's first" title since companies including Seagate, WD and Toshiba have already cracked the 750GB 9.5mm barrier. As their models indicate, the 5K750 features a rotation speed of 5400RPM, while the 7K750 spins at 7200RPM. The slower iteration has 8MB of cache, consumes 1.4W of power during read/writes, and will ship in November for $130. Its speedier sibling packs double the cache, consumes 1.8W of power, and isn't due until early 2011 for an undisclosed price.
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