Hitachi introduces 610 Gb Storage per inch square

3 August 2008 By Ankit Duseja

Hitachi has again set another record of setting up records every year. They are growing the rate of amount of data that can be stored per inch square in a magnetic recording disk. The rise which is being seen is nearly 40% per annum is giving the feeling that we are now finally entering the terabyte age.


Back in April 2005 Hitachi demonstrated 230 Gbit/in2 storage capacity, then it grew to 345 Gbit/in2 in September 2006, and it is now finally been raised to 610 Gbit/in2. The other prediction is that this perpendicular recording will finally reach its maximum level & thus further it cant be improved. Thus the need for another recording media & technology will be needed soon.

Hitachi has squeezed the head size size to just 65nm which makes data to use a very less area on the disk, and thus increasing the space. As the head narrows, the magnetic field from the write-head interferes with the data recorded in near-by tracks, causing problems such as rewriting or even deletion of data. To solve this problem caused by this nano-head, Hitachi and Hitachi GST developed a (WAS) wrap-around shield. The main magnetic pole of the write-head is wrapped with a magnetic shield and Tunneling Magneto-Resistive (TMR) head which is able to maintain a sufficient S/N ratio, was also developed for when the sensor width is narrowed.

So this annual increase indicates the tera-age is not too far nor now. But some people have to develop another storage media soon as the hard drives are reaching their maximum limits as the reading & writing heads cannot be compressed further.

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