There aren’t any benchmarks yet to see what the new Hitachi Ultrastar 7K4000 4TB HDD but with the similarities to the 3TB model some assumptions can be made.  The 7200RPM drive contains five 800GB platters and a 466Gbits/in2 areal density with a 64MB cache and a rated sequential transfer rate of up to 171MB/sec.  They also managed to increase the energy efficiency of the drive somewhat, using 24% less watts per GB while offering 33% more storage.  The Register reported on both this drive as well as the 4TB Thunderbolt edition which was recently released.

"Hitachi GST has laid a nice Easter egg: a 4TB enterprise disk drive and a first at this capacity level. It’s HGST’s second 4TB product.

This 3.5-inch drive technology first surfaced in September when Hitachi GST launched its 4TB G-Drive external Thunderbolt product. Now it has updated its Ultrastar line, jumping from the 3TB 7K3000 to this 7K4000 product."

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