The phrase appears to be a technical description of a compressed archive, specifically a "solid archive" created using the RAR format . Technical Breakdown
: Extracting a single file from the middle of a solid archive is slower because the software must process all preceding data in that "solid piece" to reach the target.
: If any part of a solid archive becomes damaged, it may be impossible to extract any files that follow the damaged section in the data stream. Solid archives - WinRAR - Documentation & Help
