World's Smallest Read Head for HDs
Techtree News Staff, Oct 15, 2007 1723 hrs IST
The interesting thing about a CPP-GMR head is that it replaces this insulating layer with a conductor, typically Copper.
Hitachi Global Storage Technologies claims to have developed the world's smallest read head for hard drives.
The newbie has been named, "Current Perpendicular-to-the-Plane Giant Magneto-Resistive" or CPP-GMR head.
And for those not-in-the-know, existing hard drives have a tunnel magneto-resistance head with two magnetic layers with an insulating layer in between.
The interesting thing about a CPP-GMR head is that it replaces this insulating layer with a conductor, typically Copper.
So, current ceases to run parallel to the middle layer; instead, it runs perpendicularly -- thereby reducing resistance and allowing shrinking of the head.
To put it simply, while today's drive heads can read media with tracks that are 70 nanometers apart, the new heads will be able to read media having tracks that are only 50 nanometers (or even less) apart.
Commercially, the first such new drives are expected sometime in 2009 or 2010.
But how will regular desktop/laptop users benefit from this? They can expect to shop for up to a 4 terabyte HDD for their desktop, and/or a 1 terabyte drive for their notebook sometime in 2011.
USER COMMENTS
Simple question..if this has already been developed, why would it take 4 long years to get terabyte hdds??
by Spoorthy, Bangalore, on Oct 15, 2007 07:00 PM, Report abuse Reply
there comes the manufacturing part... new plants needs to setup just to get these things out and few more years to push these things into the market. Thats the hurdle... pushing products after R&D takes time.
by pradeep, Bangalore, on Oct 16, 2007 08:30 AM, Report abuse
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