Toshiba's 3-D Magnetic Recording May Increase Hard Disk Drive Capacity. Tom Coughlin. Forbes. July 9, 2015.
Toshiba demonstrated a method for using magnetic fields from microwave radiation to reverse the magnetization direction selectively in a multi-layer magnetic recording media. This could lead to the development of 3-D magnetic recording where independent data is written and read from overlapping layers of a multilayer recording media and substantially increase hard disk drive capacity. "Magnetic storage is where most of the world’s accessible digital data now lives."
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