Western Digital just launched their 20 TB mechanical hard drive, with 2.2 terabytes per platter and onboard flash memory utilizing OptiNAND technology.

The 20 TB mechanical drive's flash memory is integrated "iNAND UFS embedded flash drive (EFD) on the circuit board," and also performs with a 3D TLC UFS flash memory, the capacity of which has not been released to the public. Western Digital intends to improve reliability and performance with the new drive. //

Another source of information from Western Digital is the lack of whether the 20 TB hard disk utilizes shingled magnetic recording (SMR). From the company's description of the drive, it is safe to assume that the hard disk will use SMR technology due to requiring the unit to record vast quantities of track info.

This recently launched hard drive carries nine discs inside, with each disc using a single disc capacity of close to 2.2TB and using Energy Assisted Perpendicular Recording Technology (ePMR). The magnetic head offers a cutting-edge three-stage drive technology, which enables pinpoint accuracy of the read and write head positions. Western Digital has manufactured the SOC control chip themselves instead of looking at outside resources. //

We should start seeing Western Digital begin shipping in the following months, with a technological expectancy of optimizing spaces on mechanical drives with as high as 50TBs or more over the next several decades.