Adding, deleting, or updating a single file requires rebuilding the entire solid block.
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. Talk through one's backside.7z
will you need to open single files from this archive? Revisiting 7-ZIP - Coding Horror Adding, deleting, or updating a single file requires
are you archiving? (e.g., hundreds of documents, thousands of code files, or large video files?) hundreds of documents