Magnetic recording technology

Fig. 33—Magnetic recording technologies longitudinal versus perpendicular recording.

Li, Y. and Menon, A.K. (2001) Magnetic recording technologies overview. Encyclopedia of Materials Science and Technology, 5, Elsevier, Amsterdam, pp. 4949-57. 

These examples of physical limits do not mean that magnetic recording technology has hit a brick wall when they are encountered. They do mean that workarounds or workable alternative approaches must be identified. Alternative approaches cannot mean overcoming the physical limit directly, since this is impossible by definition. Workarounds amount to engineering innovation, which identify a different way of achieving necessary ends. 

Because we have not yet found out a hopeful information storage system with a low cost and a high capacity except HDD systems, magnetic recording technology should be advanced more than 20 years at least to answer the demands in the information society in the future. If the manufacturing method is enhanced, patterned-media will be the most hopeful media to realize a density higher than 1 Tera bits/inctf. 

The current magnetic recording technology is based on tapes and discs the writing and reading processes are relatively simple to understand. They are essentially the same in audio, video and computer recording ... 

Mee, G. Denis, and Eric D. Daniel. Magnetic Recording Technology. 2d ed. New York McGraw-Hill, 1996. An older handbook, but one with particularly clear description and analysis of many of the emergent trends in the last few decades in the field of data recording and storage. 

Anisotropy is temperature dependent. This is simply because the ferromagnetic order is temperature dependent. This problem is well known in magnetic recording technology. During the past 50 years, the enormous increase in the recording density in hard disk drives has been achieved mainly by decreasing the size of the... 

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