Thank you for viewing my page. Only this model is compatible with the Roland MC 300/500. Normal operation and operating system startup have been confirmed. The following files are pre-installed: 000 - MRC-500 OS v.1.1 001 - SUPER MRC-500 v.2.0 002 - MRP-500 v.1.0 003 - MRP-500 SYST GEN 004 - MRM-500 v.1.0 005 - MRM-500 SYST GEN 006 - MRD-500 Rhythm Bank 007 - MRB-500 SYST GEN __________________________ 008 - 099 - Empty floppy disks __________________________ How to use: Press and hold the two black buttons on the Gotek, and then turn on the power without connecting the USB. Press the two black buttons on the Gotek another 10 times until a lowercase "b" appears on the left side of the screen. Select the floppy disk number you need with the buttons (e.g., 01 with the OS) and press the right button again to start up (see photo). __________________________ Returns and refunds are not accepted for reasons related to the symptoms/condition described in the product description. Please purchase only if you agree with the condition.