Re: How To Make A Bootable Macos El Capitan Usb Install Drive

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Kian Trip

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Jul 13, 2024, 8:29:59 AM7/13/24

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You have to be able to create the bootable USB drive installer. So you download El Capitan, unpack it, create the install disk... But my new MacBook won't unpack it because it think I'm trying to install too old of OS X on my new computer.

how to make a bootable macos el capitan usb install drive

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Anyone have any idea how I can get the El Capitan Installer? I can download El Capitan dmg file, but my new MacBook won't unpackaged it because it thinks I'm trying to install EC on my new laptop. I just new to get the installer file into the applications folder, so I can create a bootable USB drive from it for the old laptop.

Tom Nelson is an engineer, programmer, network manager, and computer network and systems designer who has written for Other World Computing,and others. Tom is also president of Coyote Moon, Inc., a Macintosh and Windows consulting firm.

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.

There is another way to create a bootable installer. It involves Disk Utility, Finder, hidden files, and a great deal of time and effort. If you prefer to use this method, follow our guide: How to Make a Bootable Flash Installer of OS X or macOS. The older OS used in that guide still works for El Capitan.

As far as I know, the only way to properly create a bootable Lion disc/disk is to use Disk Utility on a working Mac. However, the other option is to use a Virtualbox VM to run OS X temporarily (scroll down for that info).

Open up Disk Utility and drag the DMG file into the left-hand sidebar. If you're burning it to a DVD, insert your DVD, select the disk image in the sidebar, and hit the "Burn" button. Skip down to the last step to use it.

If you want to burn Lion to a USB flash drive, plug it in and click on it in the left-hand sidebar in Disk Utility. Go to the Partition tab and select "1 Partition" from the dropdown menu. Choose "Mac OS Extended (Journaled) on the left.

Hit the Options button under the partition table and choose "GUID Partition Table". You'll need this to make the drive bootable on a Mac. Hit the Apply button when you're done to format your drive (note: it will erase everything on the drive).

For my own case, installed TransMac on my Windows 10 laptop but it failed to work when I am trying to burn a dmg file (macOS Big Sur) to an external USB flash drive. It says the dmg file could not be restored to a Mac volume.

Finally, I get it done by using UUByte DMG Editor. The process is quite smooth and the USB drive is recognized by my Mac Mini after burning dmg file to it. The trick in here is to format USB drive to FAT32 first before burning starts. And try to use an USB 3.0 drive as old USB 2.0 device might not be recognized by Mac.

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?

InstallESD.dmg contains another disk image, BaseSystem.dmg, which is a bootable installer disk. But writing it directly to the USB drive does not work, because that would create a partition with almost no free space and still lacking some important files.

It is possible to copy with other tools (tar, cpio), just supply parameters preserving the most of file metadata. rsync supports also -X parameter, supposed to copy HFS+ extended attributes, but in practice it fails with the error "Operation not supported".

This works! I used it for making a usb from El Capitan installer, using the InstallESD.dmg that you find inside the InsallMacOSX.dmg.There is no need to try using the script, as it works with the list of commands on the read me file. so This:

Only things that need to take into account are:Run all the commands it as root! so use "sudo su"kpartx you need to add -v (verbose) to see which loop is created so :kpartx -av InstallESD.imgon my machines there was already 12 loopsevery now and then use "df" just to see which partitions and names you have in your system. The only need you need to change on the lines are.The "loop0p2" and the loop1p1 and the dev/sdX according to your usb mount.

under i just paste my terminal history that gave me a working usb drive.thanks all of the above for pointing into the right direction!starts with "sudo su"i already extracted from the installer the file InstallESD and is sitting in the working directory

After hours of trial and error, I was finally able to install OSX 10.11 "El Capitan" on my used iMac (mid 2009)!I tried to use the internet installer that came with it, but it would not work without signing into the original owner's AppleID (even though I specifically went into iTunes to "De-Authorize this computer" before wiping the original installation)

However, this contains a file called "InstallMacOSX.dmg", rather than "InstallESD.dmg". So, I needed to first convert this file into an image:dmg2img InstallMacOSX.dmg InstallMacOSX.imgThen mount the image: In Linux Mint, I used right-click --> "Open With Other Application..." --> "Disk Image Mounter"(but there are plenty of other ways to do this)Inside, there was a large file called "InstallMacOSX.pkg", which I could extract using p7zip, or (in Linux Mint):right-click --> "Open With Other Application" --> Archive Manager"Inside THERE could be found the InstallESD.dmg!

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!

I may go ahead and re-download the installer and create a new bootable USB using "createinstallmedia", just in case there was a problem with the image I used, but at least now I can boot up the computer!

This did not work for me with the official image from Apple. However with a third party DMG download it did the trick. However, the installation failed, but that may be of other reasons than the DMG.. :)

You could be facing an expired certificate issue here. Here's more on that If you've got an old macOS install image, it will probably stop working today. While this is about Mojave to Sierra. This also hold true with older OS's as well. With El Capitan and other older OS-X releases we need to use a different method, here we need to takeout the installer telling it the year is within its install window. So we need to alter the systems clock setting to manual and then back date the year to lets say 2011. Then run the installer.

Cool man this worked for me. If you've been grinding at the problem for a bit please make note of the bit where it says: Then run the installer. I changed the clock and pressed up to run the install command again and that will not work.

Thanks for the quick answer @danj :) Very strange that this is not possible, but it is solvable. Just have to swap the old HDD back in the iMac and download the installer and prepare the SSD. Am I correct?

You don't need to open the system again. You should be able to install the drive in a FireWire case and then using the Option key boot up under it to then install the OS from it, all from the 2009 system.

But, you have a sticky wicket here! If I remember correctly the 2009 Mac's will only boot up via optical drive CD disk or external FW drive other than the internal SATA drive. The 2010 models where the first models which boot up under USB.

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.

Once the application is installed you will have a application in your /Applications Folder called Install OS X El Capitan. At this point you will now be able to use the rest of the guide to create the bootable drive.

UPDATE: problem solved: the issue was that the date of my mac did not match the download date of El Capitan. To solve the issue, I let my mac launch in recovery mode and accessed Terminal where I entered:

Simply fill in the date that applies to your download (i.e. 0101000015 for January 1st 2015 at midnight), hit enter and quit Terminal. Then you will be presented with the same list as before, where you click to re-install OS X and the load should proceed without a problem.

Your hard drive may be failing, you should run fsck and give it a deep verify and repair, but it still may be on the way out of the drive is continuously screwing up even during software installs. Good luck, back up your data!