Due to its excellent data transmission speed, solid state hard disk (SSD) is the first choice of installation personnel. But mechanical hard disk (HDD) also has unique advantages, such as durability, price and so on.
According to foreign media reports, a study published by Cambridge University in nature communications pointed out that,Graphene can be used as coating material for mechanical hard disk. Compared with the current technology, graphene can not only increase the capacity by 10 times, but also be more durable.
As we all know, mechanical hard disk is mainly composed of disk, magnetic head, disk shaft and control motor, magnetic head controller, data converter, interface, cache and other parts.
Disk and magnetic head are the two main components of mechanical hard disk. The magnetic head can move along the radius of the disk, and the disk rotates at a high speed of several thousand revolutions per minute. The magnetic head can be positioned at the specified position of the disk to read and write data. Therefore, the storage density of the hard disk is determined by the space between the magnetic head and the disk.
At present, carbon based coating (COC), as a coating to protect the disk from mechanical damage and corrosion, occupies a large space between the magnetic head and the disk. Since 1990, the storage density of hard disk has quadrupled, and the thickness of COC has decreased from 12.5nm to about 3nm, equivalent to 1TB per square inch.
Now, researchers at the University of Cambridge have found that graphene can replace carbon based coatings, which can bring 10 times the storage density of traditional mechanical hard disks due to its smaller footprint.
Researchers used one to four layers of graphene instead of commercial carbon based coatings in traditional mechanical hard drives, and tested friction, wear, corrosion, thermal stability, and lubricant compatibility.
The results show that graphene not only takes up less space, but also brings unprecedented ideal performance in corrosion resistance, low friction, wear resistance, hardness, lubricant compatibility and surface smoothness.
In addition, the researchers also tested the thermal assisted magnetic recording (HAMR) technology using graphene mechanical hard disk,It is found that the thermal assisted magnetic recording technology can work well. With this blessing, the storage density of hard disk is more than 10TB per square inch.
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