Compressed archives (like .7z or .zip) are much smaller to transfer, though they must be extracted before use.
That being said, if you're looking to obtain a Guitar Hero 2 PS2 ISO file for personal use or archival purposes, here's what you should know: Guitar Hero 2 Ps2 Iso Highly Compressed
If you are looking for reliable information or files, community-driven "megathreads" are considered the safest standard: The ROMs Megathread : Frequently cited by users on Reddit's r/Roms as the most trustworthy source for verified, clean ISOs. Vimm’s Lair & CD Romance Column: The Allure and Risks of “Guitar Hero
Guitar Hero II is a masterpiece of the rhythm genre. Whether you are trying to hit 100% on Expert for the first time or just jamming to "YYZ" on Hard, playing this classic via a compressed ISO is a convenient way to access the game. File size: around 700-800 MB (compared to the original 4
Standard PS2 ISO files typically mirror the size of the original DVD, which for Guitar Hero II is approximately . "Highly compressed" versions use specific formats to reduce this footprint:
