Unix files possess both physical and logical sizes, which can create complexities in storage management depending on the filesystem in use. For instance, ZFS reports the physical block size, offering utility for disk usage commands like 'du'. However, the logical size, which might not be directly accessible, can also be important, especially in systems where the filesystem behaves like a compressed archive (such as a .zip). The user comments express skepticism about the existence of a straightforward solution to ascertain logical block sizes, hinting that such an issue may be prevalent in Unix-based systems.