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Message: <blockquote data-quote="Roe5685" data-source="post: 487417" data-attributes="member: 2841">I want to thank Mark Phelps and with due respect profusely thank alphanumeric. His deep insights were most helpful.In summary for a GPU install on a very large harddrive or raid 0 the alphanumeric tips and references have you manually prepare the flash drive.  You might not get it right the first time if you have preconceived notions like I did. However when you boot up the target machine you will get the EFI boot option. If not go back and again prepare the flash drive.The next critical step is to again follow Alpahnumeric's tips and references but most important is to use the "New" command in the install screen to make the several partitions. If "New" is not in bold try delete and then try "New" again.  It is possible to do an MBR without using "New" so you must recall "New".Thanks again. I am marking this as solved.</blockquote>