Explore the seven most common magnetic recording techniques, including LMR, PMR, SMR, HAMR, MAMR, Tape recording, and Patterned Media.
Common Magnetic Recording Techniques
Magnetic recording is a foundational technology behind various data storage devices. It is the method by which information is stored on a medium via magnetization. Here are seven of the most common magnetic recording techniques:
Traditionally, data in hard disk drives was stored using LMR. Here, data bits are aligned horizontally in relation to the disk’s spinning direction.
PMR was developed to overcome the limitations of LMR, in which data bits are aligned vertically, perpendicular to the disk, thus allowing for more data to be stored in the same space.
SMR is a technique that overlaps data tracks like shingles on a roof, increasing the track density and overall storage capacity.
In HAMR, a laser heats the disk material before it is magnetically written, which allows for data to be stored on a smaller area. It is one of the latest advances in increasing storage density.
MAMR uses a spin-torque oscillator to generate a high-frequency magnetic field that makes it easier to write data onto the hard disk.
This is a method used for long-term, large-scale backup of data. Magnetic tape drives use a long strip of narrow plastic film coated with magnetizable material.
A promising approach to increase storage density, patterned media technology involves creating isolated magnetic cells to reduce the magnetic interference between adjacent bits.
In conclusion, these magnetic recording techniques have significantly contributed to the evolution of data storage, enhancing efficiency, capacity, and reliability. As technology progresses, more advanced techniques are likely to emerge, further enhancing our ability to store and retrieve data.
