noun
permanent storage
Computing term for non-volatile storage that retains data without power.
データは永久記憶装置に保存されます。
Data is saved to permanent storage.
不揮発性メモリ is a more technical synonym often used in engineering contexts, while 永久記憶装置 is a broader term for permanent storage devices.
Compound of 永久 (permanent) + 記憶 (memory/storage) + 装置 (device).