Talk Through One's Backside.7z < No Sign-up >

If one part of the archive is corrupted, it is more likely to lose the entire archive compared to non-solid archives. Common Use Scenarios:

Ideal for long-term storage where file access is rare. Talk through one's backside.7z

It can achieve much smaller file sizes than traditional archives. For instance, a 2GB folder of similar files can be reduced to 130MB. Drawbacks: If one part of the archive is corrupted,

In solid mode ( -ms=on ), 7-Zip merges all files into a single, massive block of data before applying compression (typically LZMA/LZMA2). This allows the algorithm to find repeating patterns across multiple files rather than just within each individual file. For instance, a 2GB folder of similar files

will you need to open single files from this archive? Revisiting 7-ZIP - Coding Horror

Extracting a single file from the middle of a large solid archive requires decompressing everything that came before it.

Good for sending large, read-only data sets where maximum compression is prioritized over file access speed.