external storage; auxiliary storage
Computing term for storage devices outside the main memory, such as hard disks, SSDs, USB drives, and cloud storage.
I use an external hard disk as an external storage device.
データは外部記憶にバックアップしておいてください。
Please back up the data to external storage.
内部記憶 refers to internal memory (e.g., RAM, ROM) directly accessible by the CPU, while 外部記憶 is external storage that is not directly accessed.
補助記憶 is a near-synonym also meaning auxiliary storage, often used interchangeably with 外部記憶 in computing contexts.
external storage device
Compound of 外部 (external) and 記憶 (storage/memory), a straightforward technical term.