20TB hard drive launched before 2020 with glass substrate manufacturing

In the past few years, the hard disk density slowdown the growing speed. Although Seagate and the West continue to work hard, put more discs, use helium, continue to introduce a larger capacity hard drive, but the hard disk density to enhance the speed gradually slow down, it is an indisputable fact. Now West and Seagate are working hard on 20TB high-capacity hard drive which is manufactured with glass substrate.


So far, only the notebook hard drive using glass substrate. Compared with the aluminum plate glass has several advantages. First, the glass is stronger than aluminum, allowing manufacturers to put thinner and lighter discs. In addition, compared with the aluminum substrate, the glass substrate is more flat and more smooth, more closely together, when the heat expansion is much weaker, that is to say the ability to cope with thermal expansion stronger. Also, let the spindle press the glass plate at a given speed, the need for less power, if the use of aluminum discs, because of its weight heavier, so a little higher energy consumption.

Japanese company Hoya believes that HDD manufacturers will use glass in 3.5-inch hard drive. Hoya shows a prototype glass disc that has two thicknesses, one for 0.5 mm and another for 0.381 mm. Currently the disc thickness is 0.635 mm. There must be a gap between the disc and the disc. If the disc size is reduced by 40%, more discs can be loaded in the same capacity. The glass substrate facilitates the introduction of heat-assisted magnetic recording (HAMR). If you want to write data on the hard disk, the hard disk will heat the writing part with the laser. Seagate is ready to roll out HAMR drives in 2018 and expand capacity to 20TB by 2020.

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Wireless charging principle Detailed

Smartphones that support wireless charging are available from around the summer of 2011. Any handset device can use the global standard “Qi” specification. Parking can be charged EV (electric car) with the charging system.


Wireless charging has been in the electric toothbrush, electric shavers, wireless phones and other parts of household appliances in the practical, and now its scope of application has expanded to the field of smart phones.

At present, most of the smartphones and chargers that support wireless charging on the market are in line with the “Qi” specification developed by the industry-based “Wireless Charging Alliance (WPC)” in the United States.

Wireless charging methods include “magnetic resonance” and “radio reception” and other means, Qi is used “electromagnetic induction”. By achieving standardization, as long as it is with Qi logo products, any handset device can be charged.

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