Western Digital (WD) has announced its next biggest innovation in hard drives, and it could bring capacities all the way up to 40 terabytes.

At its San Jose, California headquarters, WD announced the world’s first microwave-assisted magnetic recording (MAMR) hard drives. The storage company claims its innovative MAMR technology will enable its future hard drives to store more than four terabytes-per-square-inch.

The result will enable hard drives that could come with 40 terabytes of capacity and beyond by 2025.

At the heart of WD’s MAMR technology is a new spin-torque oscillator that generates a miniature microwave field that increases the ability to record ultra-high-density data.

How’s it all work?

Basically, as the recording arm floats over the hard drive’s data platter, this extra radiation from the spin-torque oscillator helps excite the disk drive’s data storing medium to increase the amount of information that can be written.

Previously, WD looked into a heat-assisted magnetic recording (HAMR) technology to dramatically increase data storage capacity. However, the company realized this process introduced an entirely new manufacturing process as well as too much heat that ruined the reliability of hard drives by cooking them at 400- to 700-degrees Celsius.

By comparison, the spin-torque oscillator MAMR achieves the same effect without any additional heat or having to retool hard drives completely.

For now, MAMR technology will be first introduced into WD’s enterprise and server storage solutions. But, given that the company’s helium-filled Helio drives in November 2013 trickled down to the consumer market by March 2016 (in less than three years), we’re likely to see MAMR hard drives for regular consumers soon enough.