A device that is installed in a tape reel to permit writing on the tape. If a tape is mounted without the ring in position, writing cannot occur, the file is protected.
英
美
- 一种器件(实为一种塑料环),将它装在磁带盘上便允许在磁带上写入数据。若没有套上此环,则不能写入数据,原磁带上的文件得到保护。