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perpendicular recording[‚pər·pən¦dik·yə·lər ri′kȯrd·iŋ]
perpendicular recordingA method of digital recording on a magnetic disk in which the bits are in a vertical arrangement instead of horizontal in order to take up less space. Also called "vertical recording," Toshiba and Seagate introduced perpendicular recording drives in the 2005-2006 time frame. Other drive vendors followed, and areal densities reached 400 gigabits per square inch by 2009.
A Trillion Bits Per Square Inch
Heat-assisted magnetic recording (HAMR) combines perpendicular recording with a laser to heat the medium and bumps areal density to a trillion bits per square inch (see HAMR). See superparamagnetic limit and areal density.
|Perpendicular (Vertical) Recording|
|The magnetic flux coming out of the write pole (P2) affects the vertical bit directly below. It goes down through the bit and soft underlayer and back up the return pole (P1).|
|Longitudinal (Horizontal) Recording|
|Prior to the perpendicular method, the bits were written horizontally on the recording surface of the disk platter. (Assistance with these illustrations courtesy of Hitachi Global Storage Technologies.)|