The standard Batocera base image is only about 400-500 MB. It contains no games. A "32GB image" is a community-customized version that includes the OS plus approximately 28-30 GB of pre-loaded ROMs, BIOS files, and artwork.
Batocera.linux is a minimal distribution dedicated to retro-gaming, designed to boot directly into a gaming interface without requiring a full operating system like Windows. It is an operating system that you install on a microSD card, USB drive, or hard drive, which you then plug into your computer. When you boot your PC from this drive, it loads straight into the Batocera interface (EmulationStation). This makes it a "turnkey" solution—ready to play with minimal setup. batocera 32gb image pc download top
The safest and most stable "top" download is the official image from Batocera.io. The standard Batocera base image is only about 400-500 MB