HAMR( heat assisted magnetic recorder) could produce a 25TB disk drive. HARM drivers use a magnetic medium that requires a field of 50000 oersteds to flip a domain from north to south or vice versa. heat changes the magnetic properties of the disk for a short time, by reducing or removing the superparamagnetic effect while writing. this magnetic property sets a limit on the areal density of magnetic recording. the effect of HARM is to allow writing on a much smaller scale than before, greatly increasing the amount of data that can be held on a standard disk platter ranging between 10 and 100 times more.
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