(In reply to Michal Suchanek from comment #7) > Isn't rescue CD recompressed anyway? > > Does recomressing the zstd compressed data with xz (squashfs, initrd) > recover the space? Probably not. Compressing already-compressed payloads is inefficient. See https://mwilck.github.io/labsconf2021/#/1/5 for example. The _rpm_ size is smallest if the the payload (the modules) are uncompressed.