Download Os X El Capitan Bootable Usb
Finlay Mange
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.
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!
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.
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
El Capitan introduces a new feature called "System Integrity Protection" (SIP). A few people have asked us whether CCC "works" with SIP, and the short answer is, "Yes, absolutely". SIP doesn't have any implications for a bootable backup solution. Carbon Copy Cloner 4.1.4 is fully qualified with 10.11 El Capitan. Bootable backups created by CCC will preserve SIP, and SIP will be perfectly functional and happy on a cloned or restored system. To address the specific concerns raised by a few people, CCC can copy and set the "com.apple.rootless" extended attribute on system folders and files that are on the backup volume. I wouldn't be able to do that on the startup disk (SIP prevents that), but I'd never want to do that anyway; it would be foolish to make changes to the system files on the volume you're currently booted from.
OK so we just can't get the USB drive to boot up under the installer. It is clearly hanging during the boot process so the EFI firmware is messing us up. Lets do this (hopefully on a second thumb drive) Lets setup a bootable Sierra drive this time to see if that works.
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.
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.
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.
Be sure you format the drive and set the partition as GUID, GUID is what makes it bootable. Also be sure the process completes, it can take a while to make the drive. And of course, it will only boot a Mac compatible with OS X El Capitan.
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