89109 MO Disk 5.25″ Rewritable 1.3GB May 6, 2013July 22, 2013 KC Wong MO Disk 5.25″ Rewritable 1.3GB (Code:89109) 5.25″ Rewritable Magneto Optical Disk – 1.3GB (2x) 1024 Bytes/Sector.