Is there any Hard Disk that applies this technology?

i saw on the DW-TV channel that a German physicist called Peter Andreas Grünberg discovered the phenomenon of "giant magnetoresistance", in which weak magnetic changes give rise to big differences in electrical resistance.
And a computer hard-disk reader that uses a GMR sensor is equivalent to a jet flying at a speed of 30,000 kmph, at a height of just one metre above the ground, and yet being able to see and catalogue every single blade of grass it passes over.

http://www.research.ibm.com/research/gmr.html

This is IBM's product.

Hitachi has one too.

http://www.efluxmedia.com/news_Hitachi_Announces_4TB_Disk_Drives_through_New _Head_Technology_09610.html


Others will follow I'm sure.