Treats all files as a single block, reducing redundancy and resulting in a smaller overall download size.
Extraction speed is not affected if you are unpacking the entire game at once. Managing Your Multi-Part Archive FIFA18.part02.rar
Because this is a multi-part RAR ( part02.rar ), the "solid" feature applies across the entire set. You must have (part01, part02, etc.) in the same folder to successfully extract the game. If you encounter errors, verify that each part is fully downloaded and not corrupted. Treats all files as a single block, reducing