The red LED array shows the current disk image in the drive. The leftmose LED corresponds to X00, and the one next to the leftmost LED corresponds to X01.....etc. Up to ten disk images can be switched for one Drive (16 maximum in total in the two Drives), so the extention can be X00, X01... to X09. X can be either 'A' or 'B' selected by the slide switch. It should be noted, if the extetion name format is not the same as described above, drive operation will still function, but just the LED display does not work. The photo above shows .A03 disk image is loaded.
The green LED array shows the drive operation status. When drive turns on, two green LED bars will be on and flashing. Which two LED bars will be flashing depends on which drive is on.
When you want to switch disk images, you can only do it when drive is off. You just press the button, and it will cycle through the disk images sequentially according to the extention name. Release the button when the LED bar goes to the disk image number you desire and that LED bar will blink twice then goes off. This means the desired disk image is being loaded into the drive, and after few seconds, it lights up indicating the disk image loading is done.
The slide switch allows you to choose between Drive A and Drive B. And all the disk switching operations except the Green LED array are based on that Drive chosen by the slide switch.
Another button is provided for you to save the disk image of the drive selected by the slide switch to USB Flash drive. Everytime when you are in the Apple II operation, you don't have chance to go to iDisk Menu to save the disk image in the drive. So this button allows you to do that without entering iDisk Menu. Again you can do that only when drive is off by simply press the button and a green LED bar goes on indicating the storing process is running and after it is done, the green LED bar turns off. Write protect is not implemented in this version of iDisk, so you have to be very careful about pressing this button.