Seagate officially announced and demoed the first hard drive technology to achieve a storage density of 1 TB per square inch. The technology could enable hard drives over the next decade to reach an unheard of storage capacity up to 60 TB for a 3.5-inch drive. Helping them to accomplish this milestone is heat-assisted magnetic recording (HAMR); a next-generation recording technology that will replace Perpendicular Magnetic Recording currently used in hard drives. Seagate explained:
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Heat-assisted magnetic recording
http://en.wikipedia.org/wiki/Heat-assisted_magnetic_recording