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<blockquote data-quote="jman995x" data-source="post: 1813838" data-attributes="member: 58170">Hello Jake,Thanks for the lengthy reply.Hopefully my clarification questions/replies are not as lengthy.^^^^^^I understand that DU does not install the OS, but thanks for clarifying.Also, I thought I read somewhere that Fusion Drives couldn't be upgraded to APFS. Does that sound right?^^^^^^I seem to remember that the &quot;Partition&quot; button was greyed out when I clicked on the USB drive in DU.Having said that, I erased the USB drive entirely, followed the directions to install the &quot;install macOS Mojave App&quot; on the USB drive using the Terminal commands on the instruction webpage, and was given this Terminal result:[ATTACH=full]29295[/ATTACH]IS THIS USB BOOTABLE, even though I didn't partition the USB Stick?Since the SOLE purpose of this USB Stick (at the moment) is to serve as a Bootable &quot;Drive&quot; to get me to the point where I can deiiver its package to my iMac's OS for installation, and I don't care what else is on the USB, do I still need to partition it in order for this to be a viable Boot &quot;Drive&quot;?In other words, since I didn't partition the USB Stick, even though Terminal is indicating that it is good to go as a Bootable Drive, is that incorrect, and I, in fact, need to re-erase the USB Stick, partition it, and the do the Terminal installaton command again?Sorry, I know a lot of this stuff is second nature to you and therefore very simple, but I'm just learning this stuff and don't want to screw anything up.Thanks,Justin</blockquote>

[QUOTE="jman995x, post: 1813838, member: 58170"] Hello Jake, Thanks for the lengthy reply. Hopefully my clarification questions/replies are not as lengthy. ^^^^^^ I understand that DU does not install the OS, but thanks for clarifying. Also, I thought I read somewhere that Fusion Drives couldn't be upgraded to APFS. Does that sound right? ^^^^^^ I seem to remember that the "Partition" button was greyed out when I clicked on the USB drive in DU. Having said that, I erased the USB drive entirely, followed the directions to install the "install macOS Mojave App" on the USB drive using the Terminal commands on the instruction webpage, and was given this Terminal result: [ATTACH=FULL]29295[/ATTACH] IS THIS USB BOOTABLE, even though I didn't partition the USB Stick? Since the SOLE purpose of this USB Stick (at the moment) is to serve as a Bootable "Drive" to get me to the point where I can deiiver its package to my iMac's OS for installation, and I don't care what else is on the USB, do I still need to partition it in order for this to be a viable Boot "Drive"? In other words, since I didn't partition the USB Stick, even though Terminal is indicating that it is good to go as a Bootable Drive, is that incorrect, and I, in fact, need to re-erase the USB Stick, partition it, and the do the Terminal installaton command again? Sorry, I know a lot of this stuff is second nature to you and therefore very simple, but I'm just learning this stuff and don't want to screw anything up. Thanks, Justin [/QUOTE]

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