View full Fujitsu DynaMO 640FE specs on CNET. Fujitsu DynaMO 640FE - MO disk drive - IEEE 1394 (FireWire) - external Specs. Drivers & Utilities.

1.1kg *GIGAMO standard ** Non-ISO Introduction When the word Magneto-Optical (MO) is mentioned, the name Fujitsu comes to mind right away. It is not surprising since it was Fujitsu that first introduced the world's first 3.5-inch MO drive with 128MB MO media in 1992. Fujitsu continued developing the MO technology until what it is today, with capacities exceeding 1GB.

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The great advantage to the line of MO drives is that each newer generation of drives is compatible with the previous generation of medias. This enables you to use your older medias without the need to transfer your data to newer medias. In addition, the whole concept of the MO drive revolves around the existing floppy disk drive, where data can be written to it at any random manner, unlike CDRW discs where one needs to erase the disc before anything can be re-written on the disc.

In addition, the LIM-DOW (Laser Intensify Modulation Direct Overwrite) technology delivers faster writing performance than traditional writing methods. What is MO and how does it work anyway? As the name implies, MO involves optical and magnetic field. If we look into our Quantum physics textbook, we know that light is a travelling wave of magnetic and electric fields.

Stree teri kahani serial last episode. Since the characteristics of light is governed by these two components, by altering the magnetic field, the property of light can also be altered. With this concept in mind, the changes in the direction of a magnetic field could alter the polarization of light accordingly.

Thus, information on an MO media is basically manipulated by changing the magnetic field direction, and these changes can be detected effectively by observing the polarity of light reflected by the media. The changes in the light polarity is then translated electrically into 1s and 0s. In the writing process, a low power laser beam raises the temperature of the magnetic media layer up to the 'Curie point' (Curie point is the temperature at which magnetic change can occur). The Curie point of most magneto-optical materials is about 180-200°C.

The application of a bias magnetic field changes the magnetic direction (or better known as a change in the angle). Anyway, since the laser only heats the media locally, the magneto-optical layer cools very rapidly. Upon cooling, the material coercivity rises, and this fixes the magnetic direction. There's no way of altering the state except by using the same process as above.

Since you have to physically heat the media to about 200°C, the data written on the media is more or less secured. Thus, this is the reason why magneto-optical medias are not sensitive to magnetic fields (unlike magnetic disk medias), light or even X-Ray.

This makes them a very robust form of storage. When the drive reads from the media, the laser is reflected (sometimes transmitted, depending on the drive) from the magneto-optical layer. As light polarity can be influenced by a magnetic field, the various changes in the magnetic field on the media made during the write process changes the polarity of the laser beam accordingly. However, the changes in light polarity are rather small, and they are 'amplified' by passing them through polarizing filters. By detecting the changes in the light polarity, the drive can detect these so called pits and lands. Although this description is by no means complete, it does give a proper description of how an MO work. Skip the physics, is it reliable?

Well, if you've read the previous section, you would appreciate just how powerful the magneto-optical technology is. However, the concept behind data storage in MO medias made it more robust than your conventional magnetic disks. As I've mentioned above, the media is not sensitive to light, magnetic fields and even X-Rays. This makes it extremely safe to transport your data in your MO disk since it is immune to such elements.

In addition, the drive does not have any direct contact with the media, and this literally translates into a maintenance free drive (although you've got to make sure you keep your drive and medias away from dust). Let's test it out, shall we? The Good The installation of the drive was simple as it was truly plug and play. However, you need to have a SCSI card installed first. Since my system was already installed with a SCSI card, the installation was reduced to plugging the SCSI cable to the drive, installing the drivers and softwares and rebooting the system. The drive unit comes built with an internal power supply.