: While LZMA2 is generally superior, some users have noted that for certain highly compressible files (like ATTO bench test files), it can "fail" to compress efficiently in a single pass. Interestingly, compressing that same already-compressed file a second time can shrink it from nearly 40 KB down to just 600 bytes, suggesting quirks in how the algorithm identifies data filters.
One interesting piece about the method is its specialized efficiency with multi-threading. Unlike the original LZMA, LZMA2 can split large files into independent chunks (typically 256 MB or more), allowing it to utilize multiple CPU cores simultaneously for both compression and decompression. Key Technical Curiosities NZMA2.7z
: A testament to its "no-nonsense" design, the latest versions of 7-Zip still run on Windows 2000 , an OS released over 25 years ago, because it maintains minimal software dependencies. : While LZMA2 is generally superior, some users