You will need enough space to hold both the original files and the new, consolidated file during the process. Method 1: Using PowerISO (Most Reliable Method)
FILE "game_disk1.bin" BINARY TRACK 01 MODE1/2352 INDEX 01 00:00:00 FILE "game_disk2.bin" BINARY TRACK 02 MODE1/2352 INDEX 01 00:00:00 Use code with caution. how to convert multiple bin files to one iso repack
What are you running? (Windows, macOS, or Linux?) You will need enough space to hold both