At the most basic level, HAMR adds a laser to the hard drive head and uses nanotube-based lubrication to allow the read/write head of a disk drive to get closer to the surface of a spinning platter in order to be able to write and read more bits of data.
A chief advance with HAMR is the switch from a cobalt platinum alloy, the coating used on today's disks for data bit recording, to iron platinum, a much stronger magnetic material that helps stabilize data bits at smaller sizes, according to Seagate.
Using HAMR technology, Seagate achieved a linear bit density of about 2 million bits per inch, resulting in a data density of just over 1 trillion bits, or 1 terabit, per square inch -- 55% higher than today's areal density ceiling of 620 gigabits per square inch.
"Hard disk 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," Mark Re, senior vice president of Heads and Media Research and Development at Seagate, said in a statement.
With an areal density of 620 gigabits per square inch, today's 3.5-in. hard drives have a maximum capacity of 3TB. Laptop drives, or 2.5-in. drives, top out at 750GB or roughly 500 gigabits per square inch.
The first generation of HAMR drives, at just over 1 terabit per square inch, will likely more than double the latter capacities - to 6TB for 3.5-inch drives and 2TB for 2.5-inch models.
HAMR has a theoretical areal density limit ranging from 5 to 10 terabits per square inch, enough to enable 30TB to 60TB 3.5-inch drives and 10TB to 20TB for 2.5-inch drives.
Prior to HAMR, the most significant breakthrough in drive density was perpendicular magnetic recording(PMR), which Seagate and Hitachi use in their drives today. That technology was introduced in 2006 and is also used in magnetic tape cartridge production. PMR basically stood bits upright on a platter's surface so they could be packed closer together.
PMR technology is also expected to allow companies to reach the one terabyte per square inch milestone in the next few years, but that will also mark the technology's upper limits, Seagate said.
A mix of proven hard drive technologies and new physics, HAMR preserves perpendicular magnetics but beams a microscopic ray of laser to heat a nano-sized area on the surface layer of each disk, allowing its magnetic orientation to be encoded, or recorded, with data. When the spot cools, the magnetization is locked in a recorded bit.
For an analogy of how densely HAMR technology can pack data bits together, Seagate looked to the Milky Way, saying the technology can already store more bits per square inch than there are stars in the galaxy. It's estimated there are as many as 400 billion stars in the Milky Way.
Just as PMR had its challenges with overcoming disruptions caused by bit magnetization years ago, HAMR technology also faces significant hurdles. As drive manufacturers pack more bits per square inch on the surface of a disk platter, they also tighten the data tracks, the concentric circles on the disk's surface that anchor the bits. The challenge as those tracks tighten is overcoming magnetic disruption between the bits of data, which causes the superparamagnetic effect, causing bits to flip their magnetic poles resulting in data errors.
World’s 1st remote brain surgery via 5G network performed in China Published time: 17 Mar, 2019 13:12 · A Chinese surgeon has performed the world’s first remote brain surgery using 5G technology, with the patient 3,000km away from the operating doctor. Dr. Ling Zhipei remotely implanted a neurostimulator into his patient’s brain on Saturday, Chinese state-run media reports . The surgeon manipulated the instruments in the Beijing-based PLAGH hospital from a clinic subsidiary on the southern Hainan island, located 3,000km away. The surgery is said to have lasted three hours and ended successfully. The patient, suffering from Parkinson’s disease, is said to be feeling well after the pioneering operation. The doctor used a computer connected to the next-generation 5G network developed by Chinese tech giant Huawei. The new device enabled a near real-time connection, according to Dr. Ling. “You barely feel that the patient is 3,000 kilometers away,” he said.
Beijing Orders Alibaba To Dump Media Assets That Rival China's Propaganda Machine BY TYLER DURDEN MONDAY, MAR 15, 2021 - 07:30 PM Beijing is reviving its crackdown on the country's biggest tech firms, reminding the world that the CCP is still focused on neutralizing any and all threats to its control of the Chinese economy and its people. Even after amending China's official ideology to include entrepreneurs among the protected classes represented by the CCP (in addition to workers, farmers and soldiers), Beijing, with President Xi at its center, has apparently decided that Chinese tech firms won't follow the American model after all. Instead, their growth and competitive capabilities will be curtailed for the sake of stability at home. After Tencent was censured and strict new requirements were officailly imposed on Alibaba-owned Ant Group that will prevent the company from growing , the Wall Street Journal reports that next up on Beijing's to-do lis
Facebook says hackers saw personal info of 14 million people The exposed data included relationship status, birth date, hometown, education and the 15 most recent searches, Facebook said. by David Ingram / Oct.12.2018 / 9:55 AM PDT / Updated 10:54 AM PDT Facebook said on Friday that hackers were able to access the personal information of 14 million people through a security flaw that the company first disclosed last month, and that the data exposed included information such as recent check-ins and searches. Facebook said in a blog post that people would be able to check whether they were affected by the attack by visiting a Facebook help center online. The company also said that in the coming days it would send customized messages to users to explain what information might have been accessed. The social networking company disclosed two weeks ago that a security flaw in Facebook's "view as" feature had allowed hackers to see into and potentially take