When Hitachi -- the first disk manufacturer to go perpendicular and subsequently break the 1TB consumer disk drive barrier -- speaks about advances in hard disk technology, you'd be wise to listen. Today they're touting the world's smallest read-head technology for HDDs. The bold claim? 4TB desktop (3.5-inch) and 1TB laptop (2.5-inch) drives within the next 4 years. The new recording heads are more than 2x smaller than existing gear or about 2,000 times smaller than a human hair. Hmmm, Samsung may have to update their SSD vs. HDD graph after this, eh?

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Hitachi breakthrough: 4TB disks by 2011