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The maximum areal density of a disk drive beyond which it can no longer reliably store data. It was once thought to be as low as 20Gb/in² to 40Gb/in², but there are disk drives currently shipping with densities close to 40Gb/in². Today, researchers believe the superparamagnetic limit to be around 150Gb/in² to 200Gb/in².
This was first published in October 2002