The safest method is to use a tool like chdman to convert your original physical discs.
CHD compression reduces PS1 game sizes by 30% to 50% without stripping any game data. Download Metal Gear Solid -USA- -Disc 2-.chd
: This portion of the game is significantly shorter than Disc 1, typically taking 2 to 3 hours to complete if you watch all cutscenes. It is more linear and boss-heavy, featuring the second confrontation with Sniper Wolf, the infiltration of the Metal Gear underground maintenance base, and the climactic battles against Metal Gear REX and Liquid Snake. The safest method is to use a tool