These act as the body of the archive. Without the first volume and all subsequent parts, the data remains inaccessible, as the decompression algorithm cannot bridge the gap between missing data blocks. The Role of 7z and LZMA2
The following essay explores the technical and practical significance of multi-part compression systems like the one represented by your file. Alotta Comp 7z 002
If a transfer fails, the user only needs to re-download the specific corrupted segment (like the .002 file) rather than the entire multi-gigabyte archive. Conclusion These act as the body of the archive