For PC users 1. Hook up the player to your PC. 2. Open Windows Explorer, select your Key Ring Audio player labeled as removable drive and then right click to select format. 3. Under file system select either FAT, FAT12, FAT 16 or FAT32. 4. Click START to format the player. For Mac users 1. Hook up the player to your MAC. 2. In the Application\KEY ring 256MB or Application\KEY ring 512MB folder, click on the Firmware manager application. 3. The Firmware manager window will pop up, tick the ?Format? box and then click START. 4. When the formatting is completed, disconnect the player from the computer.