MO DISK (WHAT IS MO DISK)

A magneto-optical drive is a kind of optical disc drive capable of writing and rewriting data upon a magneto-optical disc Initially the drives were 130 mm and had the size of full-height 130 mm hard-drives (like in 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 1.44MB 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. Originally, MO discs were WORM (write once, read many) drives, but later read/write MO drives became available. The 130mm drives were available in capacities from 650MB to 9.2GB. However, this was split in halves per the sides of the disk. The 2.6GB disks, for example, had a formatted capacity of 1.2GB per side. The 130mm drives were always SCSI. The 90mm discs had their entire capacity on one side with no capability to flip them over. The 90mm drives were available in SCSI, IDE, and USB formats. Capacities ranged from 128MB to 2.3GB