| 摘要 |
A magnetic disc cartridge, having a jacket which contains a rotatable magnetic disc, is loaded into a cartridge holder of recording and/or reproducing apparatus for recording and/or reproducing signals on the rotatable magnetic disc. The cartridge has a guide groove longitudinally extending in a direction in which the cartridge is inserted into the holder for receiving a guide element provided in the holder. A shutter is movable across a window provided in the jacket between a closed position and an opened position, and includes a projection extending into the guide groove to be contacted by the guide element when the cartridge is inserted properly into the holder. The guide element thus moves the shutter is from the closed position to the open position thereof when the cartridge is inserted in the cartridge holder. |
