For Wii games, "highly compressed" refers to specific formats and ripping techniques that remove unnecessary data from the original disc:
Prioritize file integrity over small file sizes. A 300MB Mario Galaxy that crashes on the first boss is useless. A 1.2GB Mario Galaxy that plays perfectly is priceless. Wii Games Download Highly Compressed
format, which can be up to 4.7 GB regardless of how much actual data the game uses. Popular Compression Formats For Wii games, "highly compressed" refers to specific
: The raw, uncompressed disc image. These are always 4.37GB or 8GB, making them the largest and slowest to download. Where to Find Compressed Wii Games Safely For Wii games