OS X El Capitan is finally here, and if you're looking to install Apple's new desktop OS fresh from the ground up, then you'll be needing a bootable USB flash drive to get started with the process. Instructions to create a bootable El Capitan (or Mavericks or Yosemite) installer on a computer running El Capitan all seem to rely on a small (command line) executable called createinstallmedia that is part of the OS X Install application (/Contents/Resources), even the GUI options like Disk Maker X seem to rely on it. The command is as follows.

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My new MacBook-Pro

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El Capitan 10.11.6 is now released as the latest version of Download El Capitan. For OS X El Capitan users this update is recommended. The upgrade to OS X El Capitan v10.11.6 enhances your Mac's reliability, performance and protection and is advised for all users. Solves a problem that can prevent parental control accounts from saving settings.

—Yr Fthfl Srvnt decided to re-assert “I ain’t dead yet” by ordering what may well be my

Posted November 18, 2015. Hello, I love your bootables versions of OS X, Yosemite was perfectly installed on my FusionDrive with UEFI. But I think I have a problem with the El Capitan version. With the Yosemite bootable USB untouched, Clover shows the good FusionDrive partition ' Macintosh HD'. Bootable USB Installers for OS X Mavericks, Yosemite, El Capitan, and Sierra First, review this introductory article: Create a bootable installer for macOS. Second, see this How To outline for creating a bootable El Capitan installer.

last computer, a 2019 MacBook-Pro laptop, refurbished by Apple. A laptop because they’re portable.
This current MacBook-Pro laptop, also refurbished by Apple, is over 10 years old. It’s the 17-inch wide-screen. 17’s are no longer made.
It’s slow = about five minutes boot-up. I schedule my morning around it — give it time.
Sometimes it hangs; it can’t get its operating system.
It came with OS-X Snow-Leopard. Now it’s El-Cappy (El Capitan), and it’s on hard-drive #2. The original hard-drive, 500 gigs, gave up. Hard-drive #2 is one terabyte (1,000 gigs) — big enough to swallow the entire known universe.
Fortunately I had it backing up to an external hard-drive: Apple’s “Time-Machine.” We could “migrate” my old hard-drive contents to my #2 hard-drive.
$2,209 + $165.68 taxes = $2,374.68. Probably overkill, but I can afford it. In fact, it looks like I can do it outta current income: Social Security plus pension plus what I get from retirement savings.
My wife and I never spent anything. No Corvette, no speedboat, no motorhome, no kids to put through college. So Apple benefits from my largesse.
Someone told me “priorities man” = it’s what I want. I live in a dustbin full of junk and megabuck computer equipment. My TV is putrid because I never watch TV.
Others have gigantic wall-mounted flat-screens, all to better watch the Super-Bowl — which I didn’t watch.
It’s just another football-game, unless the Buffalo Bills were in it. I’ll be dead-and-gone before that happens.
An eight-core (“2.3GHz 8-core Intel Core i9”) is over-the-top for what I do, which I’m currently doing on this ancient dual-core. Mainly slinging words (writing) and processing photographs for my annual train calendar.
I felt like this antique was on borrowed time

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. El-Cappy is also a

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bit much for a dual-core.
My Photoshop-Elements can usually extract a useable photo if the photographer composed well enough — and didn’t muck up royally. My brother’s camera sets everything automatically, so his shutter-speed may be too slow to stop a train. (We photograph trains.)
An old computer is like an old car. What’s gonna fail next?
As for the user, that too is what’s gonna fail next? Physically I’m falling apart, but the gray-matter still works pretty good. (Age-76 February 5th.)

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This rig never let me down, but it’s time.
• RE: “We photograph trains.....” —My brother-and-I are railfans.

Labels: 'pyooter ruminations

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

Bootable El Capitan Download

What you need to create a bootable installer

• A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14 GB of available storage
• A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra or El Capitan

Download macOS

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• Download: macOS Big Sur, macOS Catalina, macOS Mojave or macOS High Sierra
  These will be downloaded to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
• Download: OS X El Capitan
  This will be downloaded as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It will install an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

1. Connect the USB flash drive or other volume that you're using for the bootable installer.
2. Open Terminal, which is in the Utilities folder of your Applications folder.
3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.

Big Sur:*

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.

After typing the command:

1. Press Return to enter the command.
2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
4. After the volume has been erased, you may see an alert stating that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
5. When Terminal says that it's been completed, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.
   

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
3. Select the volume containing the bootable installer, then click Continue.
4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
3. Release the Option key when you see a dark screen showing your bootable volumes.
4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
   If you can't start up from the bootable installer, make sure the External Boot setting in Startup Security Utility is set to allow booting from external media.
5. Choose your language, if prompted.
6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

For information about the createinstallmedia command and the arguments you can use with it, make sure the macOS installer is in your Applications folder, then enter the appropriate path in Terminal: