Refers to magnetic tape as a storage medium, such as in audio cassettes, video tapes, or data backup.
昔のコンピューターはデータを磁気テープに保存していた。
Old computers stored data on magnetic tape.
ＭＴ is the shorthand used in data-storage contexts, while 磁気テープ is the complete term for the physical recording medium.
magnetic tape storage
Compound of 磁気 (magnetic) and テープ (tape), a direct calque of English 'magnetic tape'.