Location
Both memory card connectors are located above the controller ports on the front side of the console.
Usage
Slide a PlayStation 2 memory card with the "PlayStation 2" logo facing upwards into the memory card connector. The console will detect it automatically and allow you to save data when the games you are playing require it.
Memory Cards
Official PlayStation 2 memory cards have an 8MB storage capacity, but some third party manufacturers offer cards with more space on them. The cards also have "MagicGate" technology, a security system supported by the console's memory card connectors that combats piracy.
Backwards Compatibility
The PlayStation 2 is backwards compatible with the original PlayStation. The memory card connectors can have original PlayStation memory cards inserted into them to use with PlayStation games, but not PlayStation 2 games.