It must be a problem with the disc itself, or the memory card that you are using is corrupted. There isn't really an actual way to fix it. Try cleaning the disc with rubbing alcohol and try again. If the game still won't save, then you might have to buy a new copy.
There is one save crystal and there are zero save points you must use the save crystal to create a save point anywhere in the crater.
There are several giant purple crystals floating around, one in your village, one in thee city, one near the beginning of Every dungeon and one right before every boss.
Go to your menu on field or save crystal and select phs after leaving kalm
you can. Just find a save sphere.
Press + to open the menu then press 2 on Save.
One save file for Final Fantasy VII requires 1 free block on the memory card.
simple put no
Save over files.
You can save via the menu on the world map, or save points in dungeons. These save points appear as blue diamonds.
by clicking the save button (.)(.) -__-
The first chance you get to save the game is after you leave the castle with Kain. You can save outdoors.
If you ask Adolf realy nice he might tell you. Hope this helps.