Cassette with recording medium, in particular magnetic tape cassette

In a magnetic tape cassette comprising a housing with top, bottom, front, rear and side walls, wherein at least one of said front, rear or side walls has at least one opening therein, which opening, when uncovered, provides a cavity in the housing such that when the opening is uncovered, recording and/or erasure is inhibited, and when said opening is covered recording and/or erasure is uninhibited;

• the improvement wherein the housing is provided with an inner wall section, substantially parallel to the wall having the opening;
• and wherein a displaceable identification part for covering and uncovering said opening is provided within the housing, said identification part having a length and height sufficient to cover said opening when in the covering position,
• said identification part comprising a hook part and a front part, said front part is beveled in the direction of the displacement of the identification part adapted to uncovering the opening,
• wherein said hook part has a hook gap which hooks over the back of said inner wall section for the identification part to slide along said inner wall section as it is displaced, said front part providing for guidance of the identification part on the inner surface of the portion of the wall having the opening;
• wherein the identification part is displaceable into the housing, sliding along the inner wall section on a path oblique to the wall in which the thereby-uncovered opening is located.