Apple TV/FM Radio System - Manual (Page 75)

2 Click the Record button in the FM Radio window.
Immediately, the Record button turns into a Stop button and
red light, and a “Recording time” counter appears that tells
you the length of time that has passed since you clicked
Record.
3 Click Stop when you want to stop recording.
Important If you don’t click the Stop button, recording
continues until the hard disk is full.
68 Chapter 4