VS-1680: Checking the Number of Megabytes Used in a Song
You can check to see the size of your song in megabytes. Use the following
procedure to view the size of the current song in megabytes:
1) Press PLAY(DISPLAY).
2) While holding SHIFT, press PLAY(DISPLAY) until the name of the current song
appears in the display. The size of the current song will be displayed in
megabytes next to "Size" under the song name.