Scene release groups (like CyB1K, Opoisso893, or Dupdux) always release PKG files with an MD5 or SHA-1 checksum.
The PS4 Blu-ray drive is a mechanical component, and like all mechanical parts, it is prone to failure. ps4 pkg roms better
If you have multiple PS4 consoles (for example, one in the living room and one in a bedroom), moving your library is as simple as moving an external hard drive. With PKG files, you don't have to carry a wallet full of discs; your entire collection fits in your pocket on a portable SSD. Scene release groups (like CyB1K, Opoisso893, or Dupdux)