Disk recording and/or reproducing device

A recording and/or reproducing apparatus for a disc-shaped recording medium adapted for recording and/or reproducing information signals for a disc-shaped recording medium housed in a disc cartridge loaded on the recording and/or reproducing apparatus, said disc-shaped recording medium having a rotary shaft inserting opening at its center and a driving pin engagement opening at a position offset from said rotary shaft inserting opening;

• said recording and/or reproducing apparatus comprising:
• a disc rotating driving unit having a rotary shaft inserted into said rotary shaft insertion opening bored in said disc-shaped recording medium and a driving pin provided at a position offset from said rotary shaft and adapted for being engaged in said driving pin engagement opening bored in said disc-shaped recording medium;
• and
• a detection switch for detecting a state of separation of said disc cartridge from said cartridge loading portion in a main body portion of the recording and/or reproducing apparatus;
• said disc rotating driving unit being driven to displace said driving pin when the separation of said disc cartridge from said cartridge loading portion is detected by said detection switch.