Magneto-optic (MO) disks combine optical and magnetic technologies (see magneto-optic disk). See ISO/IEC 13346 , multilevel optical disc , holographic storage , WORM and legality of optical storage .

Toshiba projects that this technology could enable 10 Tbpsi magnetic recording (current products are up to 1.2 Tbpsi today), and substantially increase hard disk drive capacity.