drum storage; magnetic drum memory
Historical computing term for a magnetic drum used as main memory or secondary storage, common in early computers.
In early computers, drum storage was used as main memory.
磁気ドラム refers to the physical magnetic drum itself, while ドラム記憶装置 emphasizes the complete storage unit or device.
Compound of ドラム (drum) + 記憶 (memory) + 装置 (device), a direct calque from English 'drum storage' or 'drum memory'.