The games on the PSX are CD-ROM-based, so they are limited to a maximum size of 650 Mb. But this is a lot of space. In fact, most games do not use more than a fraction of it for the actual game. What can eat up the space are the incredible full motion video intros and intermissions that PlayStation games are known for.
There is a noticeable delay while the game is loaded from the CD, which you do not get in cartridge-based games. Of course, the trade-off for faster loading is a significantly smaller amount of storage on the cartridge.
Because they are black instead of the traditional silver, PSX CDs are very distinctive. But don't let that fool you. The CDs are just as susceptible to scratches and intense heat as normal audio CDs -- even more so in fact, since a scratch on a game CD can make it totally unusable.
The games available for the PlayStation cover all of the categories. It has, by far, the largest game library of any of the consoles on the market today. Game prices range from under $10, for certain preplayed titles, to over $50 for some of the hottest new games.