Full Redump PS1 sets are massive. A single game like Final Fantasy VIII (4 discs) is approximately 2.5 GB uncompressed. A full US Redump set is over 1.2 Terabytes.
Internet Archive hosts several high-quality collections of PS1 (PSX) ROMs, including curated sets like the PlayStation Essentials and complete "Redump" verified archives. Top PS1 ROM Archives PlayStation Essentials curated collection archive ps1 roms
Access to different regional releases (NTSC-U, PAL, NTSC-J). Full Redump PS1 sets are massive