noun
write-enable ring; write ring; file-protection ring
Computing term for a physical ring used on magnetic tape reels to enable writing or protect data. Rarely encountered outside historical or specialized IT contexts.
昔の大型コンピューターでは、テープに書込み許可リングを付ける必要があった。
On old mainframe computers, you had to attach a write-enable ring to the tape.
Compound of 書込み (writing) + 許可 (permission) + リング (ring), a direct translation of the English computing term.