I've gone (as advised): Options>Media Card>...then presented with the following options;
Media Card Support - On/Off
Encryption Mode - None/Device/Security Password/ Security Password & Device
Encrypt Media Files - No/Yes
Mass Storage Mode Support - On/Off
Auto Enable Mass Storage Mode When Connected - Yes/No
Safely remove on battery door removal - Yes/No
So no mention of 'Memory' !!...???