magneto-optic disk

(redirected from M-O)
Also found in: Acronyms.

magneto-optic disk

An earlier removable, rewritable optical disk that also used magnetic technology. Introduced in 1985, magneto-optic (MO) media and drives are no longer manufactured. Refurbished drives and media are available from MaxOptix.com.

Laser-Magnetic Writing
A laser heats the optical bit to the Curie point, and a magnet changes the bit's polarity. The laser is on one side of the platter and the magnet on the other, which requires double-sided media to be manually flipped over to access the other side.

Writing initially sets the bits to zero and then writes the data in a second pass. A single-pass LIMDOW (Light Intensity Modulated Direct OverWrite) method was later added, and many drives supported the more costly LIMDOW media.

Laser Reading
A low-power laser light is reflected from the bits, and depending on their polarity, the difference in the light's rotation is sensed. See UDO, Kerr effect and optical disc.


Magneto-Optic Removable Cartridges
The 3.5" media are single sided, while the 5.25" disks are double sided. With a 50-year shelf life, up to 9.1GB of storage and capable of a million rewrites, access times are in the sub-25 ms range, much faster than optical-only CD/DVD media.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
To overcome M-O limits, the fundamental basis of limit equilibrium analysis can be used.
It can be seen that the main differences between current method and M-O method are as follows.
By this way, the shape of active wedge in original M-O method is changed from triangular to trapezoidal, and the resultant active earth pressure will be computed more realistically.
This problem was solved with the standard M-O and the proposed method.
It is clear that for [beta] [greater than or equal to] 20[degrees], M-O method has no result.