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

Mac Os X Lion Basesystem.dmg

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).

Update For Newer Models – hidden BaseSystem.dmg – BaseSystem.chunklist Mountain Lion Dmg To Bootable Usb Windows 10 If you have the latest models from Apple that came already shipped with OSX 10.7, then you may not have the “BaseSystem.dmg” but instead see a “ BaseSystem.chunklist ”, the “BaseSystem.dmg” is there it’s just. Official OS X Mountain Lion.app Installer from the Mac App Store.Both versions 10.8.4 AND 10.8.5 full installers included (zipped).Un-archive the zip archive. Basesystem.dmg – More Information. Once the Basesystem.dmg file is ran on your Mac, it may begin performing different malicious activities. These may be of all tpes, but the main one is spyware and virus actions. The bad news here is that once you try to delete Basesystem.dmg, the Mac asks to enter the password and identify as an administrator.

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'

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This guide deals with 3 ways of making a boot disk from macOS, the first one is the fastest and is done via the Terminal from a command in macOS called createinstallmedia, the other 2 are older ways are done with a mixture of finder using Disk Utility and command line.

The first way can support macOS Big Sur, macOS Catalina, macOS Mojave or macOS High Sierraand further back to SIerra, El Capitan, Yosemite and Mavericks.

Quickest Way

Download the macOS version you need but don’t install.

Attach your USB stick/drive.

Launch the Terminal from /Applications/Utilities and enter the command below and then your password when prompted, be sure to change the ‘Untitled‘ name in the below command to your external disk name:

Let it do its thing and there you have it, one bootable macOS drive.

This really is a super simple way – however if using the Terminal fills you with fear and dread, there are some GUI apps that can get the job done namely DiskMakerX and a new imaging tool that can clone a new disk very quickly – AutoDMG, although AutoDMG can not work with macOS Big Sur

Alternative Ways of building a Bootable macOS Disk.

An alternative way to make a boot disk of macOS (but not macOS Big Sur), first of all, get the app or download via the App store, if downloaded it will file in the folder Applications.

The example below uses OSX Mavericks.

Control / Left click Options, Show in Finder to get to the app, don’t install at this stage.

Located in the Applications Folder

Finding the InstallESD.dmg

To find the actual InstallESD.dmg file, control/left click the ‘Install macOS’ app and choose show contents – then navigate to Shared Support folder.

Control/Right click to show contents

Navigate to Shared Support folder to see the InstallESD.dmg file

Mount InstallESD.dmg

Double click to mount the image.

Make Invisible Files Visible

We need to see the BaseSystem.dmg inside the InstallESD.dmg

Crank open Terminal and run:

This will show all invisible files have a look inside the mounted InstallESD.dmg

Mount an External Disk

Attach a USB/external drive – this guide uses the external drive name called BootDisk, you need to make sure the format is correct, it needs to be Mac OSX Extended Journaled – if it’s not you can format that in Disk Utility.

Launch Disk Utility

Launch Disk Utility as found in Applications/Utilities and go to the Restore tab.

Drag BaseSystem.dmg to the Source field and your external disk to the Destination and click Restore.

This will mount your new macOS external disk and name it OSX Base System – but we need to add the packages.

Fix the Packages

Couple of things to fix in the newly created boot disk, remove the Packagealias at System/Installation/ folder

Now from the previously mounted InstallESD.dmg copy over the Packages folder to the same location where we just removed the alias above.

Will take a while as it holds all the install packages.

Job done now you can boot from the OSX 10.9 disk.

Make the Visible back to Invisible

If you want all to return back to normal and hide the system files run a couple more commands in the Terminal

How to create the OSX 10.9 Mavericks Bootable Drive just via Terminal

Just for the crazy ones……after Mavericks is downloaded….and again this assumes you external disk is named BootDisk

Mount the InstallESD.dmg buried deep in the app

Swap to the newly mounted image

This puts you back in the Finder in front of the newly mounted InstallESD.dmg, go back to Terminal and clone the BaseSystem.dmg to the remote USB drive

This will change ‘BootDisk‘ to ‘OS X Base System‘

Lion Basesystem.dmg Free

Remove the existing Packages alias link from the newly restored image

Copy the full OSX Mavericks Packages over to the new image….takes a while

Lion Basesystem.dmg Download

And there it is! – to eject the new bootable USB OSX Mavericks 10.9 disk ‘cd’ to home and eject

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Now you can boot up from your newly bootable disk and either Install OSX10.9 on another device or use the Terminal/Disk Utility or Firmware Password Utilities on another device.