In a standard ZIP, each file is compressed individually. In a "solid" 7z archive, all files are treated as one massive data block.
If you are looking for the "solid story" behind the file extension and why it’s often preferred over standard ZIP files, it boils down to two main advantages: efficiency and solid compression . The "Solid" Story: Why 7z is Different aimstype.7z
For massive ROM sets or game assets, the space savings compared to ZIP can be measured in gigabytes. In a standard ZIP, each file is compressed individually
The .7z extension is a staple in the gaming and emulation communities for a few reasons: In a standard ZIP
Most modern tools, including WinZip and various emulators, can now open or at least read the content of these archives directly.