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Apple Computing Products:
macOS - Desktop Hardware
What is EFI boot?
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<blockquote data-quote="dcs.79c" data-source="post: 1684826" data-attributes="member: 333068"><p>I had Yosemite on my MacBook Pro. I used Diskmaker X to create a bootable flash drive. Yesterday I did a clean install of El Capitan on my MBP. When I held down the "option" key, I saw "Macintosh HD" & the flash drive. I had minor problems installing El Capitan on my MBP but I figured them out & installed it.</p><p></p><p>This morning I tried to do a clean install of El Capitan on my Mac mini. It has Yosemite on it. I was able to cancel the installer & get to the Yosemite Desktop without screwing anything up. I started the disk utilities & the flash drive installer was listed. When I held down the "option" key, I saw "Macintosh HD", "Recovery" & "EFI boot". Why didn't I see the flash drive icon? What is EFI boot? What's going on? How do I get the flash drive icon to show up instead of EFI boot?</p><p></p><p>I read about "bless --info" so I did it & this is what came up:</p><p>finderinfo[0]<img src="/mac_images/images/smilies/Kiss.png" class="smilie" loading="lazy" alt=":*" title="Kiss :*" data-shortname=":*" />*** 49 => Blessed System Folder is /System/Library/CoreServices</p><p>finderinfo[1]: 3751013 => Blessed System File is /System/Library/CoreServices/boot.efi</p><p>finderinfo[2]<img src="/mac_images/images/smilies/Kiss.png" class="smilie" loading="lazy" alt=":*" title="Kiss :*" data-shortname=":*" />**** 0 => Open-folder linked list empty</p><p>finderinfo[3]<img src="/mac_images/images/smilies/Kiss.png" class="smilie" loading="lazy" alt=":*" title="Kiss :*" data-shortname=":*" />**** 0 => No alternate OS blessed file/folder</p><p>finderinfo[4]<img src="/mac_images/images/smilies/Kiss.png" class="smilie" loading="lazy" alt=":*" title="Kiss :*" data-shortname=":*" />**** 0 => Unused field unset</p><p>finderinfo[5]<img src="/mac_images/images/smilies/Kiss.png" class="smilie" loading="lazy" alt=":*" title="Kiss :*" data-shortname=":*" />*** 49 => OS X blessed folder is /System/Library/CoreServices</p><p>64-bit VSDB volume id<img src="/mac_images/images/smilies/Kiss.png" class="smilie" loading="lazy" alt=":*" title="Kiss :*" data-shortname=":*" /> 0x6500D7AE3A72109E</p><p> </p><p>I don't understand why I was able to do a clean install of El Capitan on my MBP, but not on my mini. I didn't have the "EFI boot" problem when I did a clean install of Yosemite on my MBP & mini. Only the keyboard, mouse & Superdrive are plugged into the back of the mini. Should I unplug the Superdrive? Is it "confusing" OS X?</p></blockquote><p></p>
[QUOTE="dcs.79c, post: 1684826, member: 333068"] I had Yosemite on my MacBook Pro. I used Diskmaker X to create a bootable flash drive. Yesterday I did a clean install of El Capitan on my MBP. When I held down the "option" key, I saw "Macintosh HD" & the flash drive. I had minor problems installing El Capitan on my MBP but I figured them out & installed it. This morning I tried to do a clean install of El Capitan on my Mac mini. It has Yosemite on it. I was able to cancel the installer & get to the Yosemite Desktop without screwing anything up. I started the disk utilities & the flash drive installer was listed. When I held down the "option" key, I saw "Macintosh HD", "Recovery" & "EFI boot". Why didn't I see the flash drive icon? What is EFI boot? What's going on? How do I get the flash drive icon to show up instead of EFI boot? I read about "bless --info" so I did it & this is what came up: finderinfo[0]:**** 49 => Blessed System Folder is /System/Library/CoreServices finderinfo[1]: 3751013 => Blessed System File is /System/Library/CoreServices/boot.efi finderinfo[2]:***** 0 => Open-folder linked list empty finderinfo[3]:***** 0 => No alternate OS blessed file/folder finderinfo[4]:***** 0 => Unused field unset finderinfo[5]:**** 49 => OS X blessed folder is /System/Library/CoreServices 64-bit VSDB volume id:* 0x6500D7AE3A72109E I don't understand why I was able to do a clean install of El Capitan on my MBP, but not on my mini. I didn't have the "EFI boot" problem when I did a clean install of Yosemite on my MBP & mini. Only the keyboard, mouse & Superdrive are plugged into the back of the mini. Should I unplug the Superdrive? Is it "confusing" OS X? [/QUOTE]
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Apple Computing Products:
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What is EFI boot?
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