ＭＯalso: エムオーFreq.FrequencyTop 20,000Meanings1nounmagneto-optical disk; MOcomputingComputing term for a type of optical disk that uses magnetic and optical technology for reading and writing data.古ふるいデータはＭＯに保ほ存ぞんしてある。The old data is stored on an MO disk.
