Advantages
Perpendicular recording can deliver more than three times the storage density of traditional longitudinal recording. Perpendicular recording was first used by Toshiba in 3.5" floppy disks to permit 2.88 MB of capacity (ED or extended density), but they failed to succeed in the market place. Since about 2005 the technology has come into use for hard disk drives. Hard disk technology with longitudinal recording has an estimated limit of 100 to 200 gigabit per square inch due to the superparamagnetic effect, though this estimate is constantly changing. Perpendicular recording is predicted to allow information densities of up to around 1 Tbit/sq. inch (1000 Gbit/sq. inch). As of August 2010 drives with densities of 667Gb/in2 were available commercially, and there have been perpendicular recording demonstrations of 800-900Gb/in2.
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