(
Heat-
Assisted
Magnetic
Recording) A technique from Seagate for increasing the density of bits on magnetic disks by using a more stable recording medium. In order to write the bit into this medium, a laser briefly heats the area. HAMR density of one trillion bits per square inch is expected to yield drives of 40 and more terabytes of capacity in the future. Using HAMR, a 20TB Seagate drive was introduced in 2021. See
superparamagnetic limit,
SATA and
perpendicular recording.