Patterned media is a magnetic storage

Magnetic storage

Magnetic storage and magnetic recording are terms from engineering referring to the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetization in a magnetizable material to store data and is a form of non-volatile memory. The information is accessed using...

 technology used to record data in a uniform array of magnetic cells, storing one bit per cell, as opposed to regular hard-drive technology, where each bit is stored across a few hundred magnetic grains. It uses photo-lithography to pattern the underlying media with the magnetic cells allowing for greater areal density

Computer storage density

Memory storage density is a measure of the quantity of information bits that can be stored on a given length of track, area of surface, or in a given volume of a computer storage medium. Generally, higher density is more desirable, for it allows greater volumes of data to be stored in the same...

than would normally be possible.