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Apple Computing Products:
macOS - Operating System
Questions on making a bootable OS X on a USB memory stick
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<blockquote data-quote="Doug b" data-source="post: 1454608" data-attributes="member: 59143"><p><strong>First and foremost</strong>. Back up all of your files to an external drive. </p><p></p><p>Do not install it on your computer before moving the install file over to the external thumb drive, or it will be deleted after the install. So, here's what you need to do:</p><p></p><p>Download ML. It will wind up in your Applications folder. Drag it over to your thumb drive (copy or move, doesn't matter). Start Lion Diskmaker, as it will also work with ML. It will find Mountain Lion on your thumb drive and format it to be bootable, so make sure there's nothing on there you don't want to lose. </p><p></p><p>Restart the computer while holding down the alt/opt key. You'll now be in Disk Utility mode. If you'd like, you can now reformat your HDD before installing ML. I always do this in order to do a totally "clean" install. I usually have Disk Utility write over the drive with a "3 pass" wipe. This way nothing is left over from before. </p><p></p><p>After that, I just install like usual and done. </p><p></p><p>Doug</p></blockquote><p></p>
[QUOTE="Doug b, post: 1454608, member: 59143"] [B]First and foremost[/B]. Back up all of your files to an external drive. Do not install it on your computer before moving the install file over to the external thumb drive, or it will be deleted after the install. So, here's what you need to do: Download ML. It will wind up in your Applications folder. Drag it over to your thumb drive (copy or move, doesn't matter). Start Lion Diskmaker, as it will also work with ML. It will find Mountain Lion on your thumb drive and format it to be bootable, so make sure there's nothing on there you don't want to lose. Restart the computer while holding down the alt/opt key. You'll now be in Disk Utility mode. If you'd like, you can now reformat your HDD before installing ML. I always do this in order to do a totally "clean" install. I usually have Disk Utility write over the drive with a "3 pass" wipe. This way nothing is left over from before. After that, I just install like usual and done. Doug [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Questions on making a bootable OS X on a USB memory stick
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