Hi
I'm trying to downgrade from el capitan to yosemite but when I try to partition the USB to create a bootable drive, the "partition" icon is greyed out and I am unable to change it. I get up to erasing it but then nothing!
Can anyone help?
Thanks!
OS X El Capitan won't let me partition a USB
Hi MKGillies,
If you are following the steps I posted on these forums for making a USB installer for downgrding back to Yosemite, then preparing your USB drive from El Capitan is easier than that (you don't have to seperately partiton the USB drive). Use these steps:
First download the OS X 10.10 Yosemite installer from the Mac App Store in the Purchases section (you may need to hold alt/option while selecting Purchases. Once it's downloaded, just quit the installer and set the downloaded file's name to InstallOSXYosemite.app (make sure only .app, not .app.app)
- Plug in your USB drive into the computer and open Disk Utility (in Applications).
- Select the USB drive from the left sidebar and click on Erase tab.
- Set the name be YosemiteInstaller - leave Format on "Mac OS Extended (Journaled)" and Scheme as "GUID Partition Table"
- Now click on Erase button and wait until the format process completes.
- Launch the Terminalapp (in Applications/Utilities) and copy-paste the following command in, and then hit Enter:
sudo /Applications/InstallOSXYosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/YosemiteInstaller --applicationpath /Applications/InstallOSXYosemite.app --nointeraction
- This will create the bootable USB flash drive. This takes between 10-20 minutes. Do not interrupt the Terminal or eject the flash drive during the process. Once the process completes, you will see the message "Copy Complete. Done."
The OS X Yosemite bootable USB flash drive will be ready for use and you can start the clean installation process.
Let me know if this answers your question 🙂
Max.
The system ask me to type p/w after copy & paste command in Terminal app.
What can I do then?
Answers the question but doesn't work,
"sudo: /Applications/InstallOSXYosemite.app/Contents/Resources/createinstallmedia: command not found"
If this is about the OS X public/app store version, those user-centric questions may be better suited for Apple's public community support forums rather than here in the developer/IDE forums, thanks.