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It's very easy to create a bootable ISO image of El Capitan, if you have aworking El Capitan system installed on your machine.

Start with going to AppStore and installing El Capitan, so you'll have anapplication named Install El Capitan in your Application list. Then, youshould follow the steps below.

There is an installation image file inside /Applications/Install El Capitan.app, named InstallESD.dmg. It's not a bootable ISO that can be usedto install the system on a virtual machine, but we'll get there. Mount thisimage to some directory by using the hdiutil tool:

The -noverify and -nobrowse options are there to make mounting operationfaster and to make sure that Finder will not automatically pop up.

Now let's create a placeholder image of our ISO file.

This can take a while.

After an empty ISO file will be created, we need to mount it:

Then, we will use asr tool to populate the contents of our new drive:

The asr tool will automatically create a new mountpoint, /Volumes/OS X Base System. We're going to put some files into this directory.

First of all, remove an invalid link that won't be needed here:

Instead of this link, we need a proper directory, full of package files. We'regoing to copy this directory from the ESD image that we have mounted few stepsearlier.

We're going to copy some additional installer dependencies as well.

After that, we can unmount stuff we don't need anymore:

Last step is to convert our ISO file into the UDTO format.

Done. The ElCapitan3.iso.cdr can be renamed to ElCapitan.iso, and can beused in virtualization software like VirtualBox 5.

The method described above was found on forums.MacRumors.com(permalink).Thanks to colt2!

In all cases you need a 8GiB+ usb storage and you will need to erase it withDisk Utility (and be very careful not to erase the wrong one!).

SD Cards: If you use an SD Card with a USB adapter, it probablyWILL NOT WORK as a bootable USB mass storage device. I'd recommend you stopby walmart real quick to pick up a 32GB USB 3.0 flash drive for $12.99.

• Disk Utility
• 7.95 GB Mass Storage / Card Reader
• Partition
• Partition Layout: 1 Partition
• Name: Install OS X <<whatever>>
• Format: Mac OS Extended (Journaled)
• Options
  • GUID Partition
• Erase

Once you've created the installation drive, you'll reboot the computer and hold down the option (alt) key until you see the list of options (generally including your hard drive, time machine, the default recovery partition, and your disk).

Yosemite 10.10

This creates a bootable usb / sd card which shows up as Recovery OS X 10.10 and will still require WiFi to complete the installation (maybe just for verification, maybe it downloads the whole thing... again, I don't know).

Mavericks 10.9

Same as Yosemite. Requires WiFi during installation.

Mountain Lion 10.8

NOTE: Many people recommend (Lion) DiskMaker Xfor Mountain Lion, but it didn't work for me.

Alternate Method

Now in Disk Utility:

1. Click on 'Mac OS X Base System' in the bottom pane under 'BaseSystem.dmg'
2. Click 'Restore'
3. Drag 'Install OS X Mountain Lion' (the partition on the drive, not the top-level drive) as 'Destination'
4. Click 'Restore'
5. Wait about 10 minutes
6. unmount 'Mac OS X Base System' and eject 'BaseSystem.dmg'

Lion 10.7

NOTE: Many people recommend (Lion DiskMakerfor Lion, but it didn't work for me.

Now in Disk Utility:

1. Click on 'Mac OS X Base System' in the bottom pane under 'BaseSystem.dmg'
2. Click 'Restore'
3. Drag 'Install OS X Lion' (the partition on the drive, not the top-level drive) as 'Destination'
4. Click 'Restore'
5. Wait about 10 minutes

m5dsums

I couldn't find my install download and it's no longer available on the App Store, so I torrented a copy that matched retail md5sums.

• eec8b65b0a8213c526f7cad2d5e8b462 Mac OS X Lion.dmg
• b5d3753c62bfb69866e94dca9336a44a Install OS X Lion.app/Contents/SharedSupport/InstallESD.dmg
• 304d377f4eb83232c6d7f580119d2db2 Mac OS X Install ESD/BaseSystem.dmg

Torrent Search: 'Mac OS X 10.7 Lion (Final Retail)'

Snow Leopard 10.6

I think you mount the DVD image and restore it to your prepared flash drive... not sure about this one.

m5dsums

I couldn't find my install download and it's no longer available on the App Store, so I torrented a copy. Not sure if this is tampered with or not since I can't validate the md5.

• ea7fe76fbd3918f57ad66a46ecad22fa Mac OS X Install DVD Snow Leopard RETAIL.dmg

Torrent Search: 'Mac OS X Install DVD Snow Leopard RETAIL.dmg'

Installesd.dmg Couldn’t Be Copied To Sharedsupport

By AJ ONeal

Did I make your day?

(you can learn about the bigger picture I'm working towards on my patreon page )

Contents Shared Support Installesd.dmg Missing File

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