hesela.devDiscrete-grains model
The discrete-grains model represents a magnetic recording medium as a tiling of grains drawn from a finite set of shapes.
A common tileset uses 1 x 1, 1 x 2, 2 x 1 and 2 x 2 rectangles. Grain proportions alone do not specify a distribution over complete tilings. [1]
In the reviewed raster-write model, a grain takes the polarity of the last bit written to it. Multiple bit locations within one grain therefore do not provide independent stored values. [2]
Geometric model tiles are different from lithographically fabricated magnetic islands in bit-patterned media. [3]
Relations
Citations
- Das and Kashyap. MCMC Methods for Drawing Random Samples from the Discrete-Grains Model of a Magnetic Medium; sections I, III-VI.
- Carosino et al. Iterative Detection and Decoding for the Four-Rectangular-Grain TDMR Model. arXiv:1309.7518v1 (2013), sections II-IV.
- Albrecht et al. Bit Patterned Magnetic Recording: Theory, Media Fabrication, and Recording Performance. arXiv:1503.06664v1 (2015), section I.
Sources & caveats
- Scope: the cited rectangular-grain research models, not a manufacturing process or a specification for current HDDs.
- Source review only. No detector, sampling algorithm or physical medium was reproduced.