I'm using a clover installer on USB in conjunction with the HS Install app. I'm a bit confused about the EFI partition and whether that it is a bit of necessary code that is always present and created by the Apple installer or purely a Clover created hack that fools Apple software into booting on a non Apple machine. I've done several installs from El Cap onwards and the EFI partition was always created as part of the process of using UniBeast so I was wondering if the hack to disable APFS was disrupting the install. I've followed your instructions but only the one big volume is being created: Create bootable USB using UniBeast and boot from it choosing the external file on the USB Open Disk Utility and wipe SSD with HFS Journaled (creating large partition that fills SSD) Click install to add files to SSD Reboot with USB and choose USB installer to boot from again Run Terminal and do the xml change Reboot from USB and boot from (modified) installer on SSD Keep choosing SSD installer after reboots until complete This results in a working system and the file system being correct but just one partition on the SSD and no EFI or other partitions. Thanks for your help and any guidance is most appreciated.