Floppy disk assembly having storage-capacity discrimination means

A floppy disk assembly adapted to accommodate a floppy disk having two faces and an abutment surface end, a head window shutter, an abutment surface disposed on the abutment surface end and to one side of the head window shutter and a discrimination hole disposed near to the abutment surface end and on the same side of the head window shutter as the abutment surface, for discriminating a storage capacity, said floppy disk assembly comprising:

• a cassette holding plate which holds said floppy disk;
• a sliding plate which has a projection and which is subjected to a spring action for causing said cassette holding plate to slide from a position at which said floppy disk is mounted/dismounted to a position at which writing/reading is performed by a magnetic head;
• a lock member which engages with said projection of said sliding plate and is allowed to rotate a guide pivot fixed to an assembly frame;
• a rod member which abuts at its first end said abutment surface of said floppy disk when mounted and is pivotably connected at its second end to said lock member 1, wherein said rod member has, adjacent to said first end, an elongated guide slot, and said rod member has, adjacent to said second end, a connecting pivot by which said rod member and said lock member are connected, wherein when said abutment surface of said floppy disk abuts said first end of said rod member, said rod member moves guided by said guide pivot causing said lock member to rotate and to release said projection of said sliding plate;
• and
• a detecting member which detects whether or not said discrimination hole is present, said detecting member located opposite a first of the two faces of the floppy disk and said discrimination hole when said floppy disk is mounted, wherein said lock member is positioned beyond the location of said discrimination hole when said floppy disk is mounted, and on the same side of said head window shutter as said abutment surface, and on the same side of the floppy disk as said detecting member.