Hi,
I use three ways to create a boot-able OS X install drive, using the installer’s built-in
createinstallmediatool, using Disk Utility, or performing the Disk Utility procedure using Terminal.
You may need a friend to down load Yosemite, if your purchased option is grey.
- Open the Utilities folder if it's closed.
- Double-click Terminal.
- It is important to remember what your hard drive was called? If you didn't call it "Installer," you'll need to change the pathname where it says /Volumes/Installer to the name of your drive. Copy the following text: sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Installer --applicationpath /Applications/Install\ OS\ X\ Yosemite.app --nointeraction
- Paste that text into the Terminal application and hit the Return key.
- You will be prompted to enter your system password the password you use to update apps on your Mac, or to login at boot.
- The process of readying the disk as a bootable drive will begin. It should say "Copy Complete" when it's done.
To use it, simply connect the drive to the target Mac with the power off. Turn the power on, hold down the
Option key, and select the drive from the list that appears on the screen.
Hello oldscribe,
I love your moniker. Thank you for your kind advice. All parts of this exercise I carried out with the internal OS X 10.11.4 as active system.
After amending the text you supplied to read:
sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Yosemite.app —nointeraction
("Untitled" being the name of the formatted but blank 2TB external HD.)
After entering this text into "Terminal" and hitting "return", the following warning appears in the Terminal window:
"WARNING: Improper use of the sudo command could lead to data loss
or the deletion of important system files. Please double-check your
typing when using sudo. Type "man sudo" for more information.
To proceed, enter your password, or type Ctrl-C to abort."
Which "data loss" and/or deletion of im
Hi ranger,
Terminal as you know is can be deadly, but as long as you have the correct target drive selected then the deletion and clean up would be part of the install procces.
But to save me a long post here is a link to an easier methord for your peace of mind.
http://osxdaily.com/2014/06/09/install-os-x-yosemite-on-external-drive/
Let us know results.
G'day oldscribe,
Thanks for your continuing help. Regarding the <osxdaily.com> link, I notice the date (created?) as being June 2014. As this was before El Capitan arrived to create so much universal havoc, I think this may not advance the cause.
With 10.11.4 internal active, I used Terminal to erase external 2TB and copy installer files etc. When Terminal instructions were complete, the 2 TB HD had been renamed from "Untitled" to "Install OS X Yosemite".
Upon opening that 2 TB HD icon and double clicking "Install OS X Yosemite" app, El Capitan prevents installation proceeding by warning "this copy of 'Install OS X' is too old...".
After rebooting with 10.10.3 external active, upon opening that 2 TB HD icon and double clicking "Install OS X Yosemite" app, Yosemite requires an administrator's name and password to be entered before installation can proceed. The contents of “Users” folder and “External 500GB Get Info do not match. This also prevents Yosemite being installed on 2TB external.
Until I can learn how to create and new admin user and new password on that 500GB Yosemite external HD that that system WILL accept, I will keep failing to circumvent the impediments both El Capitan (internal) and Yosemite (external 500GB) use to obstruct my installation efforts.
Appreciatively, ranger1.
P.S. The 2 jpg files (around 50kb each) which illustrate each failed attempt will not upload. Sorry.
