perpendicular versus HAMR tech  (Source: Seagate)
HAMR is so hype

Over the years, hard drive manufacturers have moved to perpendicular recording technology, which allowed for much higher storage capacities on a traditional hard drive platter. Seagate is hard at work on the future of hard drive storage technology that will usher in even higher capacities. Seagate has announced that it has become the first hard drive manufacturer to reach a density of one terabit per square inch on a platter.
Seagate's demonstration of the technology shows how the capacity of today's hard drives can be doubled when the technology launches in commercially available products later this decade. The tech will lead to 3.5-inch HDD's with a capacity of up to 60 TB in the decade that follows.
The technology allowed Seagate to reach the huge storage density is called heat-assisted magnetic recording or HAMR.
The perpendicular magnetic recording technology in all use currently debuted in 2006 and replaced longitudinal recording technology that had been used since hard drives were invented. Perpendicular magnetic recording is expected to reach the capacity limit of close to one terabyte per square inch in the next few years.
“The growth of social media, search engines, cloud computing, rich media and other data-hungry applications continues to stoke demand for ever greater storage capacity,” said Mark Re, SVP of Heads and Media Research and Development at Seagate. “Hard drive innovations like HAMR will be a key enabler of the development of even more data-intense applications in the future, extending the ways businesses and consumers worldwide use, manage and store digital content.”
HAMR technology allows Seagate to achieve a linear bit density of around 2 million bits per inch, which was once thought to be impossible. That allows the data density of over 1 trillion bits per square inch, which is 55% higher than the areal density of 620 Gb per square inch available today. The first generation HAMR HDD's are expected to have capacities of up to 6 TB in 3.5-inch form and up to 2 TB in 2.5-inch form. The theoretical density limit for hard drives using this technology will be up to 60 TB for 3.5-inch drives in up to 20 TB for 2.5-inch drives.
The big advance with HAMR technology was the switch in the coating used on discs inside hard drives from a cobalt platinum alloy to iron platinum alloy. The stronger magnetic material helps stabilize data bits in smaller sizes. It's nice to see research continues despite the HDD shortage the market is facing.

Source: Seagate

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