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A Magneto-optical disc and the sector partition rectangles on its surface.

A magneto-optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto-optical disc. Both 130 mm (5.25 in) and 90 mm (3.5 in) form factors exist. In 1983, just a year after the introduction of the Compact Disc, Kees Schouhamer Immink and Joseph Braat presented the first experiments with erasable magneto-optical Compact Discs during the 73rd AES Convention in Eindhoven.[1] The technology was introduced commercially in 1985.[2] Although optical, they appear as hard disk drives to the operating system and can be formatted with any file system. Magneto-optical drives were common in some countries, such as Japan,[3] but have fallen into disuse.

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Technical aspects[edit]

A 130 mm 2.6GB magneto-optical disc.
A 230 MB Fujitsu 90 mm magneto-optical disc.

Early drives are 130 mm and have the size of full-height 130 mm hard-drives (like in the IBM PC XT). 130 mm media looks similar to a CD-ROM enclosed in an old-style caddy, while 90 mm media is about the size of a regular 3½-inch floppy disk, but twice the thickness. The cases provide dust resistance, and the drives themselves have slots constructed in such a way that they always appear to be closed. Original MO systems were WORM (write once, read many), and later systems were read/write.[4]

The disc consists of a ferromagnetic material sealed beneath a plastic coating. The only physical contact is during recording when a magnetic head is brought into contact with the side of the disc opposite to the laser, similar to Floptical drives, but not the same. During reading, a laser projects a beam on the disk and, according to the magnetic state of the surface, the reflected light varies due to the magneto-optic Kerr effect. During recording, laser power is increased to heat the material to the Curie point in a single spot. This enables an electromagnet positioned on the opposite side of the disc to change the local magnetic polarization. The polarization is retained after the temperature drops.


Each write cycle requires both a pass to erase a region and another pass to write information. Both passes use the laser to heat the recording layer; the magnetic field is used to change the magnetic orientation of the recording layer. The electromagnet reverses polarity for writing, and the laser is pulsed to record spots of '1' over the erased region of '0'. As a result of this two-pass process, it takes twice as long to write data as it does to read it.


In 1996, Direct Overwrite technology was introduced for 90 mm discs eliminating the initial erase pass when writing. This requires special media.

By default, magneto-optical drives verify information after writing it to the disc, and are able to immediately report any problems to the operating system. This means writing can actually take three times longer than reading, but it makes the media extremely reliable, unlike the CD-R or DVD-R media upon which data is written without any concurrent data integrity checking. Using a magneto-optical disc is much more like using a diskette drive than a CD-RW drive.

During a read cycle, the laser is operated at a lower power setting, emitting polarized light. The reflected light has a change in Kerr rotation and Kerr ellipticity which is measured by an analyzer and corresponds to either a logical 0 or 1.

The 130 mm drives have been available in capacities from 650 MB to 9.2 GB. However, this is split in half over both sides of the disk. The 2.6 GB disks, for example, have a formatted capacity of 1.2 GB per side. The 130 mm drives were always SCSI. The 90 mm discs had their entire capacity on one side, with no capability to flip them over. The 90 mm drives were produced in SCSI, IDE, and USB formats. Capacities range from 128 MB to 2.3 GB.

While they were never particularly popular with consumers (the main consumer market was the 90 mm drives), the 130 mm drives had some lasting service in corporate storage and retrieval. Optical libraries, such as the Hewlett Packard 40XT, were created to automate loading and storing of the disks. A self-contained unit holding 16 or more disks and connected by SCSI to a host computer, the library required specialized archival software to store indices of data, and select disks. Popular uses were for legal document storage and medical imaging, where high reliability, long life, and (at the time) high storage capacity were required. The optical libraries could also manually be used on a Windows 2000/XP machine by selecting and ejecting discs under the Computer Management icon's Removable Storage Service, but this is cumbersome in practice.


Light Intensity Modulated Direct OverWrite (LIMDOW) technology used a different write technology, which improved on the performance levels of earlier magneto-optical devices.[5][6]

LIMDOW disks and drives worked on the same basic principle as a standard magneto-optical drive: the write surface is heated up and took on a magnetic force applied from outside. But instead of using a magnetic head in the drive to make the changes, the magnets were built into the disk itself.[7]

The LIMDOW disk has two magnetic layers just behind the reflective writing surface. This write surface can take magnetism from one of those magnetic layers when it is heated up to one temperature; but if it is heated up further, it will take its polarity from the other magnetic layer. To write the data onto the disk, the magneto-optical drive’s laser pulses between two powers.

At high power, the surface heats up more and takes its magnetic charge from the north pole magnetic layer. At the lower power, it heats up less and takes its magnetic charge from the south pole layer. Thus, with LIMDOW the magneto-optical write process has a single stage, improving write times.

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Because the magnetic surface is adjacent to the writing surface, rather than somewhere outside the disk itself, the magnetic writing can be done at a higher resolution, including that of the resolution of the laser spot doing the heating up.

In the spring of 1997 Plasmon launched its DW260 drive, which used LIMDOW technology for a higher level of performance than previous magneto-optical drives. LIMDOW drives that shipped in the second half of 1997 has search speeds of less than 15 ms and data transfer rates in excess of 4 Mbit/s, which are fast enough for storing audio and streaming MPEG-2 video.


Minidiscs are magneto-optical discs used to store music.

Magneto-optical drives were first offered in NeXT computers. They were later also offered in Canon products.

SonyMiniDiscs are magneto-optical, and Sony produces many other formats of magneto-optical media. Sony continues to manufacture one type of MiniDisc available in Japan; the rest of the world only has access to dwindling new stock from vendors on sites such as eBay or Amazon. Tascam and Onkyo continue to manufacture MiniDisc decks while Sony ceased production of hardware in 2013.

Pinnacle Micro was a major manufacturer of magneto-optical drives. 3.5' drives were 128 MB and 230 MB. 5.25' drives produced were 650 MB and 1.3 GB (Sierra), 2.6 GB (Vertex) and 4.6 GB (Apex). The Vertex and Apex were non-ISO standard drives and used proprietary media. Pinnacle Micro has ceased production of these products.

LMSI produced 5.25' magneto-optical drives as well.

Maxoptix, a spin-off of Maxtor Corp., is a major manufacturer of 130 mm or 5.25' magneto-optical drives. A current model is the T7-9100 drive, which has a maximum capacity of 9.1 GB and is downward read and write compatible with 5.2 GB, 4.8 GB, 4.1 GB, 2.6 GB, and 2.3 GB magneto-optical disks, and read compatible with 1.3 GB, 1.2 GB, 650 MB, and 600 MB magneto-optical disks. Popular older models of 5.25' Maxoptix MO drives are the T6 Star, T6-5200 and T5-2600 MO drives. Maxoptix was acquired by Techware Distribution in 2008.

Fujitsu was a major manufacturer of 90 mm magneto-optical drives, exceeding 2 GB in capacity, but they have discontinued production and sale of this product category.

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PDO Konica Minolta was the last manufacturer of 90 mm 3.5' magneto-optical drives. They had a 3.5' 1.3 GB USB external pocket drive available for sale in the United States and Europe.

Floptical drives[edit]

Magneto-optical drives are not Floptical drives, which likewise combine ferromagnetic and optical technologies, albeit in a different manner. Flopticals are 21 megabyte 3.5' magnetic diskettes using optical tracks to increase the tracking precision of the magnetic head, from the usual 135 tracks per inch to 1,250 tracks per inch. No laser or heating is involved; a simple infrared LED is used to follow the optical tracks, while a magnetic head touches the recording surface. The drives can also read and write traditional 3.5' diskettes, although not the 2.88 megabyte variety. Flopticals were manufactured by Insite Peripherals, a company founded by Jim Burke.

Progress in early 2000s[edit]

At the Consumer Electronics Show in January 2004, Sony revealed a 1 gigabyte capacity MiniDisc known as 'Hi-MD.' Hi-MD recorders can also double the capacity of regular minidiscs with special formatting that renders the disc unreadable (or writable) by non-Hi-MD minidisc recorders.

As with all removable storage media, the advent of cheap CD/DVD drives and flash memory has made them largely redundant. Magneto-optical disks in particular were expensive when new, and while highly reliable, the slow writing time also is a detriment. Magnetic tape formats like LTO have far surpassed MO media for high capacity enterprise-grade backup storage.

Recent progress[edit]

In 2016 a new phenomenon, magnetization melting by photoinduced photoconductors, was discovered in magnetic photoconductors.[8] It was demonstrated that extremely low light intensities in the range of 1 μWcm−2 can be used to read/write magnetic information in fs (10−15 s timescales) allowing high-speed, high-density data storage in principle.

See also[edit]

  • Domain Wall Displacement Detection (DWDD), a magneto-optical reproducing technology developed by Canon Inc. and Sony


  1. ^K. Schouhamer Immink and J. Braat (1984). 'Experiments Toward an Erasable Compact Disc'. J. Audio Eng. Soc. 32: 531–538. Retrieved 2018-02-02.
  2. ^Mueller, Scott. Upgrading and Repairing PCs (19th ed.). p. 584. ISBN978-0-7897-3954-4.
  3. ^
  4. ^Mueller, Scott (August 2003). Upgrading and Repairing PCs. Que. ISBN0-7897-2974-1.
  5. ^Mueller, Scott. '12 'Magneto-Optical Drives''(PDF). Upgrading and Repairing PCs (15th ed.). p. 670.
  6. ^'LIMDOW recording on magneto-optical disk'. Computer weekly (white paper). Hewlett-Packard. 1999.
  7. ^'LIMDOW'. Encyclopedia (definition). PC Magazine.
  8. ^Náfrádi, Bálint (24 November 2016). 'Optically switched magnetism in photovoltaic perovskite CH3NH3(Mn:Pb)I3'. Nature Communications. 7: 13406. arXiv:1611.08205. doi:10.1038/ncomms13406. PMC5123013. PMID27882917.

External links[edit]

Wikimedia Commons has media related to MO.
Retrieved from ''

A few months after my initial post my computer crashed, so I got a new one with Vista and have had that OS until now. Page 1 of 2 1 2 Last Jump to page: I hope these instructions helps someone, I know people have purchased these on e-bay and other people have updated their systems and find they can’t use it anymore. Did you also try all the procedures that are listed above? Thanks for the info – I bought one of these adapters before I saw all the “it doesn’t work” posts It’s not the computers that keep having problems, it’s the users!! I located the driver download at:

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MICROTECH XpressSCSI USB SCSI Db25 B Converter Adapter Cable iMac G3

Pinnacle Scsi & Raid Devices Driver Download Windows 10

I located the driver download at: To start viewing messages, select the forum that you want to visit from the selection below. Welcome to WinDrivers, wardmd.

Will it work with the ZIP Plus? In particular, would I be better off trying to get it to work on XP instead of 7 which I ubs prefer? I right clicked C: I used this to access a Pinnacle Micro Apex 4. A few months after my initial post my computer crashed, so I got a new one with Vista and have had that OS until now.

The problem is the newest driver Microtech cssi was for 98 and I know this is 5 years later but thank you so much. July 5th, I’ll try to check back to answer any questions if anyone trys this out. So, where can one find the driver for Windows ?

Thank you, j Hey Jeff, sorry I didn’t see that you posted until today. If midrotech try CCT’s suggested Google search without any quotes, you’ll get a lot of results.

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Click on the “Driver” tab Turned on the Iomega Jaz Drive and nothing happens Read in some other thread the determining factor is what is done with the “terminal pin” by such a device. Originally Posted by CoolObserver.

Maybe everyone has replaced them but me: Never, ever approach a microtecn saying or even thinking “I will just do this quickly. I don’t have a JAZ drive which is known to work.

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Luckily persistence pays off! To get it to work on XP, this is just by luck of screwing around, I did the following: Originally Posted by jeff1. Or is there some kind of list of devices that work?

Last edited by MrCreosote; February 15th, at USB not working on older machine Win. After registering, the same link but using “Download this file by logging in with your existing account” results in an actual file You may have to register before you can post: I really needed to access this drive and I could see it.

Select “No” to letting Windows Automatically Search, do the search manual I found the drivers fine and I kept thinking I needed the driver for the Apex, but other comments on various forums said that windows should find it as a drive if the Apex was set to Direct Access, which it is.

Bookmarks Bookmarks Digg del. May 19th,

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