How Make El Capitan Bootable Usb From Dmg File

An El Capitan .DMG is downloadable directly from the Apple Support page, which provides instructions on how to make a bootable volume, with a major caveat On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg

Creating the bootable OS X El Capitan installer erases the USB flash drive you're using. Before you proceed, make sure you have a backup of the flash drive's contents or that you don't care that the data will be erased.

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I would like to know how to make a bootable USB device with that file. Note that I have a USB key with a MBR partition. I am not sure, but it should be using GUID to be recognized by my macbook pro?

However, the sha1 hash did match any of the values at: -installer-checksums#mac-osx-installers-sha1-checksums6198647687 bytes, openssl sha1 InstallESD.dmg --> 732f873cbcf38d9e544e659d2429bd4444416cdaI am pretty sure the file is legit (since I downloaded it directly from Apple Support), so I edited the "mkosxinstallusb.sh" script and added it to the approved list--> see the line starting with "supported_checksums="...", and just added it to the end before the last closing quote)Also, make sure your USB thumb drive is completely empty before you start the script. In my case, I actually plugged it into the mac and formatted it with Disk Utility to "OS X Extended (Journaled)" (GUID Partition table) before I started. (I had tried it once before with a partially occupied USB drive, and it ran out of space before it could finish). I am not sure how much difference it made to format it withDisk Utility, but that is what worked for me!I then ran "sudo bash mkosxinstallusb.sh /dev/sdX "InstallESD.dmg", and the script took care of the rest.Finally, I could boot up the Mac while holding "option/alt" and my USB drive appeared as a bootable device! 17 minutes later I can startup OSX!

What is the proper way to make a bootable USB with OSX El Capitan (for the 2008 iMac) from Ventura. I have downloaded the El Capitan installed and have formatted the USB drive in the standard way but can't seem to tweak the terminal command to create the bootable USB drive.

Yes, you can, depending on what your MacBook's OS was when you first got it. If the MacBook first came with El Capitan, and you updated the software to Mojave, then it will work. But if your Mac came with Sierra and higher I don't assume it will work to make a bootable USB Drive.

Many Mac users like to make a bootable installer drive for installing OS X El Capitan, whether for performing a clean install, or for making it easier to install OS X 10.11 onto multiple Macs. We will walk through creating a bootable install flash drive from OS X El Capitan with the final public version.

Apple has now made the El Capitan file from their website into a .dmg file. In order to use this file to create a bootable drive, you must do these steps before you are able to use the createinstallmedia command.

So, I did the dumb, I erased the HDD on an '09 iMac (El Capitan) without verifying that the third-party-created thumbdrive installer (DiskCreatorX) actually worked as a bootable drive on the machine. Turns out it didn't, and then I ruined it anyway by trying to change the partition size/filesystem type from 64 GB OS X Journaled to ExFAT 12 GB (I'm not sure why on earth I thought that would work and not erase the partition.. duh).

Hi @verasme from experience what i've used to make bootable OS X disks is a tool called DiskMaker X, It uses the "Install OS X El Capitain" from your /Applications folder which you've downloaded from the App Store, and takes about 10-15 minutes to create a bootable disk without the hassle.

@Frustr-As-Hell see if this helps. I have an 8 GB USB flash drive named ElCapitanInstaller that I will be turning into the installer. The drive is formatted with a GUID Partition Map as an OS X Extended and Journaled file system and plugged into the computer I'm using to make the installer USB. In the Applications folder on that computer I have the Install OS X El Capitan application downloaded from the Mac App Store. Now that I have all those conditions met, if I run the command below it should create the installer on the USB drive labeled ElCapitanInstaller.

parameter which is the path to the OS X El Capitan installer that was downloaded from the Mac App Store. The --nointeraction switch is simply telling the createinstallmedia binary to not require any interaction in the terminal when running the command. Does this explanation help and allow you to make the USB installer media?

If you have multiple computers that need the El Capitan upgrade, then a bootable install flash drive will make the process easier and faster, since the install file is over 6 GB in size (about a gig larger than Yosemite was!) and could take some time to download on each computer individually.

Before proceeding, make sure you have copied all of your important files from your USB flash drive to another place, because this process will wipe your flash drive and reformat it. Also, make sure that your flash drive is 8 GB or more, because the installer file alone is over 6 GB.

Update: While you need at least 8 GB free to install El Capitan, it might not be enough to make a bootable drive. So if you get an error saying there isn't enough disk space, you'll need to get a 16 GB or larger thumb drive.

I can make an El Capitan, High Sierra, or Mojave bootable USB just fine...so I think it's something wrong with the Sierra image. I have a feeling you can't make a bootable Sierra USB either with that download. Any ideas? Thanks.

You need to make a bootable installer because the ML installer itself won't run under El Capitan. Trying to, you get a message that the copy of "Install OS X" is too old to be opened on this version of OS X. There are many instructions on how create a bootable Mountain Lion installer on a computer running Mountain Lion, a Mavericks installer on a Mavericks system up to an El Capitan installer under El Capitan. There are also instructions on how to create a bootable Mavericks or Yosemite installer under El Capitan. But I have not found any instructions of how to create a bootable Mountain Lion installer under El Capitan.

Clearly Apple must have added some extra verification steps to this installer cloning process that now rejects the Mountain Lion installer. There are many ways one could try to solve this. Personally, I have three bootable clones going between 9 months and 24 months old, I could boot of one of them and try things. Otherwise one could try things iteratively, ie, install Mavericks and try to run the Mountain Lion installer from there or try to create a bootable ML installer from there.

In principle, any OS installer app from Mavericks upwards could work with my method. I'd try the latest one first and if things don't work try older ones too. As a test run, I'd suggest you try to create a Sierra (or High Sierra) bootable USB stick. Copy the following into Terminal, hit enter, and type in your admin password (adjust paths as necessary):

PS It really isn't very important for me to understand this, as I will never need to make a Mountain Lion bootable installer. I have Sierra and High Sierra USB installers, so feel free not explain further, although I am interested.

I have a MacBook Air, June 2012 currently running Mavericks. The El Capitan installer file came down to my Applications folder without problem, but multiple repeat attempts to create a bootable USB (16gb) drive using Diskmaker X 5 has failed. The program appears to go through all the steps, but finally the USB drive is never findable as a bootable drive.

The good news is that it's on a separate external drive, that makes the process pretty easy. Just create a new El Cap virtual machine in fusion. When it gets to the migration wizard (*before* you create a user), plug in the external USB drive and migrate from it to the new virtual machine.

This guide deals with how to make a bootable disk of either OSX 10.11 El Capitan, 10.10 Yosemite or 10.9 Mavericks. It is done via the Terminal from a command Apple introduced since OSX Lion called createinstallmedia , all you need is the original OSX app installer and a spare external drive to make a copy of the new OS installer on which you will be able to boot from.

With the announcement of a ship date for El Capitan, perhaps you are counting down the days to when you can inflict it upon your production Mac. Or perhaps, like me, you're going to test it on your kid's Mac first and hope it doesn't wreck his Minecraft worlds. In either case, now is a great time to take another look at your backup hygiene. Many people don't realize this, but if you apply the "next major OS" upgrade to your Mac, Apple makes it darn near impossible to go back. The rub lies primarily within Apple applications such as Mail, Calendar, Address Book, etc. When you upgrade to the next OS, the data stores for these applications are upgraded as well, in a manner that is not backwards-compatible. So if you loaded El Capitan onto your system and realized that some major piece of productivity software doesn't work, getting back to Yosemite is not only challenging and time consuming, but you're also going to have a lot of trouble getting your email to work. That is, of course, unless you have a bootable backup of your pre-upgrade system.

Before you upgrade, make a bootable backup of your current system with Carbon Copy Cloner, detach the backup disk and set it on a shelf. Learn more about how to protect yourself from upgrade calamities here: Getting Ready for the El Capitan Upgrade be457b7860