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Magneto-optical disk

Historical evolution

The magneto-optical disk was developed in the early 1980s and has been put into use since 1989. It is the product of the combination of traditional magnetic disk technology and modern optical technology. With the rapid upgrading of PC hardware equipment, users have put forward higher requirements for mobile storage devices, and MO entered the market. The MO drive uses a combination of magnetism and magnetism to achieve data repetitive writing. The size of the MO disc is similar to a three-inch floppy disk, which can be read and written repeatedly for more than 10 million times. At the same time, MO discs also have a protective case, so MO is better than CD-R/RW in many aspects. Its storage capacity is much larger than that of a floppy disk. Generally, the storage capacity of a 3-inch floppy disk is 1.44MB, while the storage capacity of a magneto-optical disk can reach several hundred MB. For example, a common magneto-optical disk has a capacity of 230MB. It has a larger capacity than the previous hard disk, and it can be carried as easily as a floppy disk. Compared with floppy disks, magneto-optical disks are not "squeaky" at all. They are not affected by magnetic fields (it uses magneto-optical characteristics to store data), and do not affect the reliability of their data under general pressure. This is much better than floppy disks. Up. In addition, operating the MO drive can be accessed at any time like operating an ordinary hard disk, and the software can even run directly on the MO. Although the speed of MO is still inferior to that of hard disk, the use effect is quite satisfactory, and the price of magneto-optical disk is not too expensive, and the storage life is extended to more than 50 years, thus it has won the praise of "permanent" optical disk. . Because of its large storage capacity and convenient portability, it plays an important role in storing graphics, image files, and large database files. Magneto-optical disks have extremely wide applications in the advertising industry. On the one hand, because of the early floppy disk capacity and data security, it is far from meeting the needs of the advertising industry. On the other hand, many typesetting machines use magneto-optical disks as interfaces.

Technical parameters

3.5" Common capacity of magneto-optical disks

  • 128MB: 512Bytes/Sector;

  • 230MB: 512Bytes/Sector;

  • 540MB: 512Bytes/Sector;

  • 650MB: 2048Bytes/ Sector;

  • 1.3GB (called "GIGAMO"): 2048Bytes/Sector;

  • 2.3GB.

Jaz Expandable Hard Drive

Jaz Drive(Jaz Drive) Iomega) company uses hard disk technology to make removable storage devices. Jaz was initially only 500MB when it was first introduced, and it became very popular after the introduction of 1GB hard disks in the mid-1990s. Many digital output companies like to use it because of the capacity In addition, the speed is several times faster than that of the main competitor Magneto-Optical Disk (MO) at the time. By the end of the 1990s, the 2GB version was launched, but because the hard disk of ordinary computers at that time had exceeded 10GB, plus CD-R and external hard disk The popularity of Jaz Disk has made the huge Jaz disk no longer popular.

Jaz Drive has two types, built-in and external, and must be used with the SCSI interface. Later Jaz Drive once provided a small Parallel- SCSI converter, but it was very unstable under Windows 98 at the time, so it did not increase the sales of Jaz Drive.


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