https://docs.redhat.com/en/documentation/red_hat_enterprise_linux/9/html/interactively_installing_rhel_from_installation_media/assembly_creating-a-bootable-installation-medium_rhel-installer#create-bootable-usb-linux_assembly_creating-a-bootable-installation-medium

 
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  In chapter 4.5, the 'dd' cmd of making a Bootable USB stick in MacOS misses one important parameter which can cause very slow transfer speed. Recommend to add parameter 'bs=512K' and 'status=progress' to speed up the transfer and show user the progress.