6: Save your game often in games that have a save state system. Don't run long gaming sessions without saving your game progress along the way, it will eventually freeze if you don't. I know something about the consoles memory system? I think? if you don't save often your console can get data backed up somehow? and your console will not take anymore temporary data or, something I don't know so could someone else explain? this better then I can?
After some thought I think I have a theory on why I think the following quote is true.,
older CD based consoles have two primary types of data, temporary data, and. semi Permanent data. Semi Permanent data is stored on a CD based console's save state. To a memory card or a hardrive (etc)
and the temporary data is stored on each and every keystroke, or button pressed. Temporary Data I think holds a video game together, (for example) on a 3D platformer video game you've just made a jump 3 times. So you pressed the jump button 3 times. Well those 3 button presses and those 3 jump action. was just placed into the CD consoles temporary storage. during the current gaming session.
If you make a save state some of the Temporary data is then stored to your save state, but some of the old Temporary data remains until you restart your CD based console. the Semi Permanent aka the save state data is the place holder file for the game console to read the disc. after you turn off or reset your game console. (I assume), and is created so the CD/DVD/Bluray console can read the data off the physical disc exactly where you left off in your previous game session.
Similar to like how you can skip music tracks on most music CD players. I think this was how it worked on all or most, 5th, and 6th, and 7th, generation disc based consoles where a laser was used.
Feel free to correct me on anything I got wrong, most of this is just my own educated guess from playing on various PC's and video game consoles in my life.
sometimes consoles need to relieve themselves of temporary data or they'll freeze up sometimes. just like when you drink a gallon of water and your body needs to go pee before you wet yourself.
this is an open discussion and I don't know everything, but this is just how I think they work.(edit)
I am not a programmer, but I also believe that the reason why so many retro game had the enemies respawn and disappear. every time you moved forward or backwards up or down in a console video game. As you jump up down and move forward in a 2D platformer for example, each time the console needed to load that portion of the cartridge and disc and programmers I think needed a way for the game to use less of this so called temporary data, to try to avoid a quicker freeze-up. Temporary data (for example) can also be a score or a life or continue limit
ROM data meaning "Read Only Memory", is the physical data on the cartridge or CD/DVD/Bluray itself, and it is the
permanent data . A video game console needs to load off the cartridge's or disc's ROM data. On the game itself but, the ROM/Physical data cannot be changed and needs to load from some kind of position, before it let's you play or continue the game.
The reason why CD based consoles have dead bodies disappear in FPS games, was due to a temporary memory issue, if the dead bodies of game characters remained it would use too much temporary data and would freeze any the game console faster.
What I can't quite explain is how video game CD based consoles played music at the same time you played the game.