a rewritable optical disk that uses a combination of magnetic and optical methods. MO disks use removable cartridges and come in two form factors. The 3.5" disks hold 128MB, 230MB and 640MB, and the 5.25" disks hold 650MB, 1.3GB, 2.6GB and 5.2GB. The latter are double sided, but must be removed and flipped over to use the other side., arvuti magnetilise salvestusega, kuid optilise (laserikiire abil toimiva) positsioneerimisega andmekandja. Läbimõõt nagu kasutatavaimal disketil (3,5 tolli), kuid mahutavus sellest mitusada korda suurem.