Can’t flash ROCK image to flash drive

[Martin_Webster]

Are you running MacOS Catalina? If so, see this thread …

Archive Corrupted Error in Etcher

Have a go with ApplePi-Baker v2 which has instructions on granting Catalina Full Disk Access… balenaEtcher is 226.4MB, ApplePiBaker is 8.4MB. I really wonder what those extra 218MB are up to?