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Mac OSX Bootable Disk error code (-9999,0)

Hi I am trying to make a bootable disk with OSX El Capitan so I can continue to use this computer with a newer operating system.

I have installed the disk named it (INSTALLER) and formated it to MAC OSX Extended (Journaled) with a GUID Partition

I downloaded the OS X El Capitain install package and placed it in my applications folder.

I then go to the Terminal and this is the error i get:

Last login: Sat Apr 18 20:15:27 on ttys000

Users-iMac:~ user$ sudo /Applications/Install\ OS\ X\ El\ Capita

> n.app/Contents/Resources/createinstallme

> dia --volume /Volumes/INSTALLER --applic

> ationpath /Applications/Install\ OS\ X\ El\ Capitan.app

Ready to start.

To continue we need to erase the disk at /Volumes/INSTALLER.

If you wish to continue type (Y) then press return: Y

Failed to start erase of disk due to error (-9999, 0).

A error occurred erasing the disk.

Users-iMac:~ user$

Any insight on how to complete the making of my bootable disk and fix this error?

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You’re likely hitting a known issue as Apple has expired the certificate in many of the installers. Here’s a bit more on the issue: If you've got an old macOS install image, it will probably stop working today

Apple issued a replacement How to upgrade to OS X El Capitan jump down to step 4 to get to the file link. Once you down load it double click to open the wrapper and then drag out the installer inside. Double clicking on it will launch it.

Here’s how set up your bootable OS installer drive How to make a bootable OS X 10.11 El Capitan installer drive

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Hello, I had the same problem! I solved it by using a larger USB memory stick. Everything I had found said that 8GB was large enough, however when I used a 32GB USB memory stick everything worked for me.

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The newer OS installers require 16GB

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