Verbatim 5.25" 9.1Gb Write-Once MO Disk, Magneto optical disk, 13.3 cm (5.25"), 40 year(s) Verbatim 5.25" 9.1Gb Write-Once MO Disk. Product type: Magneto optical disk. Size (imperial): 13.3 cm (5.25"). Archival storage life: 40 year(s)