Physics
The limitation of Perpendicular recording is often characterised by the competing requirements of Readability, Writeability and Stability commonly known as the Magnetic Recording Trilemma. HAMR is one technique proposed to break the trilemma and produce a workable solution. The problem is that to store data reliably for very small bit sizes the magnetic medium must be made of a material with a very high coercivity. At some capacity point the bit size is so small and the coercivity correspondingly so high that the magnetic field used for writing data cannot be made strong enough to permanently affect the data and data can no longer be written to the disk. HAMR solves this problem by temporarily and locally changing the coercivity of the magnetic storage medium by raising the temperature above the Curie temperature. Above the Curie temperature the medium effectively loses coercivity and a realistically achievable magnetic write field can write data to the medium.
Read more about this topic: Heat-assisted Magnetic Recording
Famous quotes containing the word physics:
“The pace of science forces the pace of technique. Theoretical physics forces atomic energy on us; the successful production of the fission bomb forces upon us the manufacture of the hydrogen bomb. We do not choose our problems, we do not choose our products; we are pushed, we are forced—by what? By a system which has no purpose and goal transcending it, and which makes man its appendix.”
—Erich Fromm (1900–1980)
“The labor we delight in physics pain.”
—William Shakespeare (1564–1616)
“We must be physicists in order ... to be creative since so far codes of values and ideals have been constructed in ignorance of physics or even in contradiction to physics.”
—Friedrich Nietzsche (1844–1900)