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Shingled Magnetic Recording (SMR)


Conventional Magnetic Recording (CMR) consists of tracks written parallel to each other where the minimum track width is constrained by width of the write head. Otherwise there would be adjacent track interference. However in Shingled Magnetic Recording (SMR) the write head is intentionally larger. The larger write head can increase the capability to magnetize the media; thus enhancing the readability, writability and stability of the media. Instead tracks are overlapped on top of each other much like a shingled roof of a house. This, can in turn dramatically increases the areal density of the media, up to 1.3 times kTPI on the same real estate!





Helium Drives


Most HDD are commonly enclosed with air. A novel approach sweeping the industry is to fill the drives with inert gas like Helium. Helium drives reduce oxidation within the drive and media components and reduce aerodynamic drag. This allows for heads to fly lower decreasing head media spacing (HMS) which in turn increases read write capacities. They also save power due to the lower vibration and friction. Media tribology are designed to ensure such lower flying heights are capable.

Upcoming Tech


Next generation media require even smaller and more densely packed magnetic bits. These tiny magnetic layers are highly susceptible to thermal influences and as a result can become highly unstable. One solution is to use high coercivity materials. This makes it difficult for current write heads to induce sufficient magnetic field to cause magnetic bit flipping.

Microwave-Assisted Magnetic Recording


Microwave-Assisted Magnetic Recording (MAMR) makes use of a Spin Torque Oscillator which produces microwave radiation situated on the drive heads. MAMR employs frequencies in the range of 20-40GHz. The microwave energy is highly localized and is able to lower the coercivity of underlying magnetic layers enabling writing.

Heat-Assisted Magnetic Recording


Heat-Assisted Magnetic Recording (HAMR) employs a laser to lower the coercivity of the magnetic layers on the disk. The rapid rise of temperature and ensuing coercivity drop is done in a period of less than a nanosecond. The writer then is able to write the necessary domain alignment. Once the disk cools down it will return to its high coercivity levels to keep its data integrity.