磁じ気きドラム記き憶おく装そう置ち

• 磁じ気きディスク

  Magnetic disk storage, which largely replaced magnetic drums; disks offer faster random access and higher capacity.

• 磁じ気きテープ

  Magnetic tape storage, a sequential-access medium; drums provided faster random access but lower capacity.

Compound of 磁気 (magnetic), ドラム (drum), and 記憶装置 (storage device). The term directly describes the technology.