One thing I have always hated about the CD BIOS is the inability to view the sizes of your game saves, and how much space you have left. Fortunately, some CD games have tools for this. I use the tool in 3x3 Eyes to view my save files, but unfortunately 3x3 Eyes takes quite a while to get through the intro logos and requires a 410B save file to avoid a long cutscene before you can get to it.
Does anyone know of any better memory tools in a game?
This also includes MB128 games. For that I use Emerald Dragon, which works quite well, but is also a bit basic. Apparently Private Eye Doll has a better tool, but I haven't been able to try that one yet.