How much NV-RAM storage space does a CD-i player have?
According to the Green Book, every CD-i player should at least provide some way to store at least 8 KB of data. In most players, this storage space is implemented as battery-powered NV-RAM (Non-volatile Random Access Memory). The data is kept in this memory when the player is turned of or unplugged from the mains. NV-RAM can be used by an application to store high scores from games, personal presets, Favourite Track selections for Audio-CDs, Favourite Picture Selections for Photo-CDs, prefered language settings, etc.