<title>Magneto-optical recording enhanced by magnetic recording techniques</title>

Discussion on magnetic recording techniques

Journal of the British Institution of Radio Engineers ◽

10.1049/jbire.1960.0104 ◽

1960 ◽

Vol 20 (11) ◽

pp. 884-885

Author(s):

C.P. Gerrard ◽

R. Noble ◽

B.J. Steptoe ◽

H.M. Harrison ◽

J.R. Herbert ◽

...

Keyword(s):

Magnetic Recording ◽

Recording Techniques

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Advanced optical and magneto-optical recording techniques: a review

Microsystem Technologies ◽

10.1007/s00542-003-0307-x ◽

2003 ◽

Vol 10 (1) ◽

pp. 66-75 ◽

Cited By ~ 11

Author(s):

D. Jenkins ◽

W. Clegg ◽

J. Windmill ◽

S. Edmund ◽

P. Davey ◽

...

Keyword(s):

Optical Recording ◽

Recording Techniques

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Particulate Recording Media

MRS Bulletin ◽

10.1557/s0883769400060188 ◽

1990 ◽

Vol 15 (3) ◽

pp. 53-62 ◽

Cited By ~ 24

Author(s):

M.P. Sharrock

Keyword(s):

Magnetic Field ◽

Magnetic Recording ◽

Rotating Disk ◽

Electrical Signal ◽

Optical Recording ◽

Information Storage ◽

Pulse Code Modulation ◽

Code Modulation ◽

Increasing Demand ◽

Phase Amplitude

Magnetic recording is a very useful and versatile technology, and one that is continuously evolving to serve the increasing demand for information storage and to meet the challenge of competitors such as optical recording. The basic principles of magnetic recording are described in detail elsewhere and briefly below.The elements of a magnetic recording system are a magnetizable surface layer carried on a flexible tape or on a rotating disk, and a transducer that can both write information to and read information from this surface. The tape or disk, often called a recording medium, and the transducer, called a head, move with respect to each other. The information to be stored is originally contained in an electrical signal, either by direct analog representation or via frequency, phase, amplitude, or pulse-code modulation. In response to this signal, the head in the writing mode generates an intense, localized magnetic field that is capable of changing the direction and degree of the magnetization in the surface material. Each time the input signal changes sign, the writing field changes direction and a transition between regions of opposite magnetization is created. As the head moves along the surface, a series of these transitions is created along a track. The resulting magnetization pattern of the tape or disk becomes itself the source of a spatially varying magnetic field.

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Ultrahigh-Density Recording Technologies

MRS Bulletin ◽

10.1557/s0883769400036319 ◽

1996 ◽

Vol 21 (9) ◽

pp. 17-22 ◽

Cited By ~ 80

Author(s):

Mark H. Kryder

Keyword(s):

Data Storage ◽

Magnetic Recording ◽

Computer Systems ◽

Hard Disk Drives ◽

Hard Disk ◽

Time Frame ◽

Optical Recording ◽

Disk Drives ◽

Slowing Down ◽

Long Term Storage

Magnetic recording and optical recording are the major technologies used to provide long-term storage of information in today's computer systems. Magnetic recording has been used for data storage in computer systems for over 40 years, and the advances in technology that have occurred in that time frame are nothing short of phenomenal. One might expect that after 40 years of dominance, the rate of progress in magnetic recording would be slowing down and that other technologies would be moving in to replace it. However rather than slowing down its rate of progress, magnetic recording is now advancing at a faster rate than at any time in the past. Magnetic hard-disk drives represent the largest segment of the data-storage business, and the number of hard-disk drives sold is increasing at about 20% per year. Tape drives continue to enjoy a very substantial market and are also advancing at a rapid pace while flexible disk drives continue to appear in every personal computer sold and have recently increased capacity by nearly two orders of magnitude.Optical recording was introduced into the marketplace in 1989 and has secured a significant market. However thus far, optical recording has primarily found new market niches, rather than being directly competitive with magnetic recording. CD-ROMs are widely used for the distribution of prerecorded information—a business that is now comparable in size to the magnetic-tape-drive business. On the other hand, erasable, optical drives, which were first introduced in 1989, have not had nearly as much success and have much smaller markets than either magnetic hard drives or tape drives.

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