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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