HD heads are kept from contacting the platter surface by the air that is extremely close to the platter; that air moves at, or close to, the platter speed.[citation needed] The record and playback head are mounted on a block called a slider, and the surface next to the platter is shaped to keep it just barely out of contact. It's a type of air bearing.
In modern drives, the small size of the magnetic regions creates the danger that their magnetic state might be lost because of thermal effects. To counter this, the platters are coated with two parallel magnetic layers, separated by a 3-atom-thick layer of the non-magnetic element ruthenium, and the two layers are magnetized in opposite orientation, thus reinforcing each other.[10] Another technology used to overcome thermal effects to allow greater recording densities is perpendicular recording, first shipped in 2005,[11] and as of 2007 the technology was used in many HDDs.[12][13][14
In modern drives, the small size of the magnetic regions creates the danger that their magnetic state might be lost because of thermal effects. To counter this, the platters are coated with two parallel magnetic layers, separated by a 3-atom-thick layer of the non-magnetic element ruthenium, and the two layers are magnetized in opposite orientation, thus reinforcing each other.[10] Another technology used to overcome thermal effects to allow greater recording densities is perpendicular recording, first shipped in 2005,[11] and as of 2007 the technology was used in many HDDs.[12][13][14
No comments:
Post a Comment