Install Yosemite on USB
I have macOS maverick on my 2008 MacBook Air and want to install Yosemite on USB. which USB should I use to install Yosemite
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From the wording, it is unclear if the User ( you ) intend to make a Bootable Installer on the USB Drive.
Or to actually install Yosemite as a functioning and bootable Drive to boot the computer into the Yosemite Drive
The below will make a Bootable Installer on the USB Drive
To perform this action will require booting from a Bootable Installer.
The Bootable Installer can Only be performed on an Apple Computer
This will have to be performed from a Qualifying Computer to run the version of macOS to be made on the Bootable Installer. Example : Bootable Installer of Yosemite would have to be done on a computer that Qualifies to run Yosemite.
Notation: If the computer being used to perform this action is Too New or Too Old to qualify to run the version of macOS - this computer can not be used.
Alternative is, to gain access to a Qualifying Apple Computer from a family member, friend or associate.
Once that is done read on for preparing the Destination computer >> Only works on Intel Based Apple Computers.
1 - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.
2- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive.
3 - It will present options >> Disk Utilities >> View >> View ALL attached Drives.
4 - Choose the Upper Most Drive ( not the volumes indented and list below ).
5 - Formatting for macOS 10.13 High Sierra and below requires HFS Journaled with the GUID Partition Map
6 - Once that is done >> backup out of Disk Utilities and choose install macOS.
7 - Follow the prompts and it may automatically reboot several time.
8 - Upon a final reboot - Setup Assist will present with the newer version of macOS.