Posted by : Rohit Hazra Saturday, April 21

Hello Readers,
These last couple of weeks have been a bit tough ones a lot has happened in my life but i know you all are not interested in that and so whenever i'll get a chance, i'll post. I apologise for being absent and will recover for it soon.

Today I have picked a topic that has been requested by a few people though many of you would be knowing about it, I am sure that you'll pass this post to those who don't know about it.

HAMR - Heat Assisted Magnetic Reader


About a year ago or so, we had a person who visited our school an demonstrated about HAMR technology. He worked for SEAGATE and well i'll put his name whenever i could recall. The facts that he disclosed were astonishing but i recently witnessed it. A few friends of mine having a 1tb External HDD complained that their HDD crashed. This was may be because the recent advances in hard drive technologies suggest that the current perpendicular magnetic recording technology(PMR) may be hitting its limits in the not too distant future. Infact, Seagate agrees that the end is in sight and that the industry will have to transition to a new approach that will allow hard drive manufacturers to continue on the path of massive storage improvements.
Well this is where HAMR technology comes to play a vital role. While PMR may hit just about an aereal storage of 1 Tb/inch^2, heat assisted technology will take the industry into the range of 50 Tb/inch^2.

HAMR was developed by Fujitsu in 2006 so that it could achieve one terabit per square inch densities. Now you must be wondering that what is actually a HAMR technology? Well there are many sites that tell you what is it but in a scientific language and as stated earlier this article stays simple; for Non-Pros;, so Heat-assisted magnetic recording ( HAMR ) is a technology that magnetically records data on a media that is more stable using laser thermal assistance to first heat the material. HAMR takes advantage of a highly stable magnetic compounds such as iron platinum alloy. These materials can store single bits in a much smaller area without being limited by the same super paramagnetic effect that limits the current technology used in hard disk storage. The only catch being that they must be heated to apply the changes in magnetic orientation.

What Actually Happens?

The Read/Write Head

The hard disks we use store the bits (data) Perpendicularly, this PMR technology is lagging in the requirements of Readability, Writeability and Stability commonly known as the 'Magnetic Recording Trilemma' . HAMR is one technique proposed to break the trilemma and produce a workable solution. The problem is that to store data reliably for very small bits, the magnetic medium must be made of a material with a very high coercivity (coercivity measures the resistance of aferromagnetic material to becoming demagnetized).
The Recording Media

At some capacity point the bit size is so small and the coercivity correspondingly so high that the magnetic field used for writing data cannot be made strong enough to permanently affect the data and data can no longer be written to the disk. HAMR solves this problem by temporarily and locally changing the coercivity of the magnetic storage medium by raising the temperature above the required temperature . Above this temperature the medium effectively loses coercivity and an achievable 'magnetic write field' can write data to the medium.

Practical Application

Most of your Hard Disks since 2006, use the PMR technology 

Well In March 2012 Seagate became the first hard drivemaker to achieve the milestone storage density of 1 terabit per inch^2 using HAMR technology.
HAMR could increase the limit of magnetic recording by more than a factor of 100. This could result in storage capacities as great as 50 terabits per square inch, and Seagate believes it can produce 300 terabit (37.5 terabyte) Hard disk drives using HAMR technology.

I guess we all hope would hope for the same.
Thank you and leave your comments.
Till then stay updated.

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