Sony MCS-1 Operating Instructions Manual page 8

2 Connected device indicator
The icon shown here indicates the type of media currently inserted in or
connected to the MCS1.
The icon showing completion of the finalization process also appears
here. For details, see page 22.
3 Operation mode/message display
Gives information about the current operation status and shows various
messages.
4 Navigation guide indicator
Shows what functions the buttons of the unit performs in the current
operation mode.
GB
8
"Memory Stick" media
Digital still camera and USB storage media
CD-R
Finalized CD-R. For details, see page 22.