Nikon D80 Camera

During shooting, or when the shutter-release button is pressed halfway, the number of images that can be stored in the memory buffer at current settings is shown on the exposure-count displays in the control panel and viewfinder. "r06" indicates that six images can fit in the camera's buffer, "r08" would indicate eight frames. Any other number could be displayed as well. Burst mode is used when you want to hold down the shutter button and continuously shoot. You are probably shooting in burst mode and your buffer is full, set the camera to single shot and see if that helps.