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User profile for user: ccie14140
ccie14140 Author
User level: Level 1
12 points

Instructions produce non-bootable USB drive

I have followed the instructions for creating a bootable USB drive with El Capitan which seem to execute without issue, i.e. receive "Done." in the Terminal.


However, the USB drive does not show up as a bootable disk in the preferences.


Anyone else run into this issue and have any suggestions?


Thanks.

Posted on Jan 4, 2020 12:01 PM

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User profile for user: Kappy
Kappy
User level: Level 10
361,879 points

Posted on Jan 4, 2020 12:19 PM

Here's what I have used many times with success:


Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra


First, review this introductory article: Create a bootable installer for macOS. Second, read this How To outline for creating a bootable macOS installer. Simply use the Terminal command by copying and pasting the command line for the version of macOS from the list below. You will need an 8GB USB flash drive that has been partitioned and formatted for use with OS X as well as an installer for the desired macOS version that you have previously downloaded from the App Store.


Drive Partition and Format


  1. Open Disk Utility in the Utilities' folder.
  2. After Disk Utility loads select the drive (out-dented entry with the mfg.'s ID and size) from the side list.
  3. Click on the Erase button in the Disk Utility toolbar. Name the drive, "MyVolume". <---- IMPORTANT!
  4. In the drop down panel set the partition scheme to GUID. Set the Format type to Mac OS Extended (Journaled.)
  5. Click on the Apply button and wait for the Done button to activate. When it does click on it.
  6. Quit Disk Utility.


Create Installer


Open the Terminal in the Utilities' folder. Choose the appropriate command line (in red) depending upon what OS X installer you want. Paste that entire command line from below at the Terminal's prompt:


sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app


Press RETURN. You will be asked for your admin password. It will not echo to the Terminal window. Then press RETURN again. Wait for the return of the Terminal prompt signifying the process has completed. It takes quite some time to finish. Be patient.


The bootable installer can be used to install this version of macOS. Shut the computer down. Insert your flash drive into a USB port. Start the computer like so:


Boot Using OPTION key


  1. Restart the computer.
  2. Immediately after the chime press and hold down the  "OPTION" key.
  3. Release the key when the Boot Manager screen appears.
  4. Select the disk icon for the USB flash drive.
  5. Click on the arrow button under the disk icon.




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Question marked as Top-ranking reply
User profile for user: Kappy
Kappy
User level: Level 10
361,879 points

Jan 4, 2020 12:19 PM in response to ccie14140

Here's what I have used many times with success:


Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra


First, review this introductory article: Create a bootable installer for macOS. Second, read this How To outline for creating a bootable macOS installer. Simply use the Terminal command by copying and pasting the command line for the version of macOS from the list below. You will need an 8GB USB flash drive that has been partitioned and formatted for use with OS X as well as an installer for the desired macOS version that you have previously downloaded from the App Store.


Drive Partition and Format


  1. Open Disk Utility in the Utilities' folder.
  2. After Disk Utility loads select the drive (out-dented entry with the mfg.'s ID and size) from the side list.
  3. Click on the Erase button in the Disk Utility toolbar. Name the drive, "MyVolume". <---- IMPORTANT!
  4. In the drop down panel set the partition scheme to GUID. Set the Format type to Mac OS Extended (Journaled.)
  5. Click on the Apply button and wait for the Done button to activate. When it does click on it.
  6. Quit Disk Utility.


Create Installer


Open the Terminal in the Utilities' folder. Choose the appropriate command line (in red) depending upon what OS X installer you want. Paste that entire command line from below at the Terminal's prompt:


sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app


Press RETURN. You will be asked for your admin password. It will not echo to the Terminal window. Then press RETURN again. Wait for the return of the Terminal prompt signifying the process has completed. It takes quite some time to finish. Be patient.


The bootable installer can be used to install this version of macOS. Shut the computer down. Insert your flash drive into a USB port. Start the computer like so:


Boot Using OPTION key


  1. Restart the computer.
  2. Immediately after the chime press and hold down the  "OPTION" key.
  3. Release the key when the Boot Manager screen appears.
  4. Select the disk icon for the USB flash drive.
  5. Click on the arrow button under the disk icon.




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Instructions produce non-bootable USB drive

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