Effect On Hard Drives
Superparamagnetism sets a limit on the storage density of hard disk drives due to the minimum size of particles that can be used. This limit is known as the superparamagnetic limit.
- Older hard disk technology uses longitudinal recording. It has an estimated limit of 100 to 200 Gbit/in²
- Current hard disk technology uses perpendicular recording. As of August 2010 drives with densities of 667Gb/in2 are available commercially. Perpendicular recording is predicted to allow information densities of up to around 1 Tbit/in² (1024 Gbit/in²).
- Future hard disk technologies currently in development include: heat-assisted magnetic recording (HAMR), which use materials that are stable at much smaller sizes. They require heating before the magnetic orientation of a bit can be changed; and bit-patterned recording (BPR).
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