Heat Assisted Magnetic Recording (HAMR) is a technology developed to significantly increase the amount of data that can be stored on a magnetic device, such as a hard disk drive.2-Magnetic Changes: The heated spot becomes temporarily less magnetically stable, which allows the recording head to change the magnetic orientation of that spot, effectively writing data.This heating makes the disk material more receptive to magnetic changes, allowing for data to be written to much smaller regions on the disk, thus greatly increasing the areal density1.Here's a simplified explanation of how HAMR works:

1-Data Writing: A small laser diode attached to the recording head heats a tiny spot on the disk.