Magnetic tape cassette including erasure prevention means, and cassette operating device for same

摘要

A magnetic tape cassette system includes an erroneous erasing preventing member which is controlled by an operating device on a cassette deck to prevent erroneous erasing of a tape cassette. The erroneous erasing preventing member includes a space with an opening provided on a peripheral wall of a tape cassette, and an opening and closing member which in a first position prevents erasing of the tape cassette and in a second position closes the opening to the space, thereby allowing the tape cassette to be erased.