4.1GB 8X 5.25" rewritable mago-optical (MO) disk single Sony"s 4.1GB rewritable mago-optical media are 5.25" disks patible with a wide range of optical drives. They"re treated with Sony"s advanced polycarbonate substrate for extra durability and shock resistance. They support ISO standards and are tested up to 100 years of archival life. They are highly resistant to heat magic fields and contamination and immune to head crashes. Sony MO media withstands up to 200000 load/un load cycles or more. All Sony media includes a lifetime warranty.Primary InformationMedia Type : Mago-Optical disk Media Form Factor : 5.25" Storage Removable Capacity (Native) : 4.1 GB PC Compatibility : PC; Mac Storage RemovableWrite Speed : 8X Recording Format : 512 bytes/sector Service&SupportService & Support Type : Lifetime warranty UNSPSC CodeUNSPSC Code : 43202000