Diskutil list Enter the commands given below to create the USB flash drive installer.Make a bootable USB drive Install of Macbook Pro OS Mountain Lion.Moreover, people might be looking for extra features and have other options as well for Linux or MAC OS computers. Use the command given below to determine the identifier for the flash drive. The steps below are for OS X and macOS. In other words, there is more than one way to create a USB flash drive installer from a Snow Leopard ISO file.This is the process I used to make a bootable USB drive of the Mountain Lion Operating System on my Macbook Pro. How you start that rescue media can vary depending on the operating system you are using, but there are a few general guidelines that can help get your machine started, regardless of the OS you. As a result, booting from USB media is becoming the standard.Make a bootable installer drive: The quick wayThis is the process I used to create a bootable USB drive of Mountain Lion OS X for my Macbook pro. Difficulty rating 2/10, maybe even 1/10, super easy!The Catalina installer app will be in your Applications folder, so you can go there and launch it later to upgrade your Mac to the new operating system. This process for making a boot drive can work for other Macbook types too.
I used a 32GB USB drive, 12GB is the minimum amount of Geebees you need. 12GB or more USB Flash Drive. Internet Connection to download the 4GB Mountain Lion install file from Apple. I have not tested this with other Macs, it should work 9/10. Without the USB drive it will take hours. Using a USB drive method without the downloading makes a full reset take 30 minutes. Preparing the USB driveTurn the Macbook pro ON. I got my 8GB USB drive from Ebay for $6.No extra Mac software is required to make or use the USB boot drive method. I used a separate 8GB USB Flash drive for my OS BOOT DRIVE to keep a permanent solution. This is optional because you can copy the files onto your hard drive and then on to the OS DOWNLOAD USB flash drive again whenever you need it. Optional 8GB or more Flash drive for a permanent USB drive, or you can reuse the OS DOWNLOAD DRIVE. ![]() Then click options just below this box and select the GUID partition table option, then click OK.Now on the right of this area enter a name for your drive, like “OS X Installer” and change the format to “Mac OS Extended (Journaled). Make sure you clicked the main entry for the Flash drive.In the partition area first click on the “choose” above the big box (in the “volume scheme” area) and change it to “1 partition”. If you do not see the option to partition you did not click the correct drive on the left or clicked the sub heading. Now turn on the Macbook pro while keeping hold of the CMD and r key. Once the Macbook pro is off hold the CMD and r keys. Downloading the OS Install Files From AppleNow with the formatted and partitioned OS DOWNLOAD USB DRIVE inserted shut down the macbook pro. Check to make sure it is the correct drive before agreeing! I am not responsible for your mistakes here!Once it is complete you will have a clean USB drive ready for the Lion Operating system download.End of formatting and partitioning the OS DOWNLOAD USB drive procedure. This is important because we want to download the files from Apple onto our USB drive. Agree to this and select YOUR USB FLASH DRIVE AS THE LOCATION to install. Now it will ask for verification through your internet connection. Every Macbook Pro has this feature to reinstall the operating system at anytime.Once it has loaded, release the CMD+r keys and choose the second option – “Reinstall Mac OS X”, and hit continue. Remove the USB at the black screen! Not before, and not after.You pulled out? great. A few seconds after the timer goes to zero seconds remaining the the screen will turn black. So, once the timer is close to 0 BE READY. You need these installation files to create a bootable USB Lion drive. If you wait it will start the installation and delete the files from the USB and you’ll have to do it all again. If the screen is black, pull out the flash drive! Don’t wait, just pull it out. Qemu emulator macThis is the main file you need.Insert your OS BOOT USB DRIVE. Look inside and you will find a big 4GB file ending in. I copied them into the Download folder, but you can put them anywhere you like.Now open the folder you copied onto your hard drive. Copy all the files from it to any location on your hard drive. Now insert your USB drive with the operating system on it. Press CMD+SPACEBAR and type “disk utility”, then select disk utility from the list. Dmg file to open and it will mount the. If you are reusing your OS DOWNLOAD DRIVE partition and format it again using the above procedure once you have copied the operating system folder to your hard drive (we just did this in the last paragraph!).Click on this big. Use the usb guide above to do this. It shows two area you need to enter. At the top of the right pane choose “restore”. You should have your OS BOOT USB DRIVE attached to your Macbook Pro and you will see the “InstallESD.dmg” file shows as mounted at the bottom of the left panel of disk utility.Click on the InstallESD.dmg file on the left. Then shut down, or restart the computer. Once complete you have your complete USB BOOT DRIVE! How To Use Your OS X USB BOOT DRIVETo use the USB boot drive on your Macbook Pro, first insert the drive into the Macbook. This takes around 30 minutes. So drag and drop that from the left panel to the Destination part.When you are happy click the restore button to start the restore process. If it is not, then enter that now by browsing to the big file and inserting it into the Source box.For the destination we want our BOOT USB DRIVE. Simple instructions for zapping P RAM below.To zap PRAM shut down the Macbook Pro. This sounds bad, but it’s nothing really. If you get this error you will need to zap PRAM. The Macbook will shut down and restart using the USB drive as the Boss.There was a problem installing Mac OS X, try reinstalling. Select the USB drive (it is usually orange). This will show a special screen allowing you to select a startup disk drive. I take no responsibility if any of the advice here or on this website damages anything! I have completed every step here myself and have no fear doing it again, it is safe as far as I am concerned.After zapping the PRAM insert the Installer USB Flash Drive into the Macbook Pro and turn off. The PRAM holds simple hardware variables, like brightness level and it’s a safe procedure recommended on the Apple website. This is the indicator that the PRAM has been cleaned. It is near the CMD key on the left of a Macbook Pro keyboard.When you turn on the Macbook Pro with the above keys held it will quickly reset and the screen will go to full brightness. OPTION is the “Left ALT” key and has a small bird symbol. Click it and it will take you to the install Lion screen. Choose the orange Hard drive that represents your USB drive. Just hold this ALT key and start the Macbook Pro.When it starts it will show you some hard drive options. The ALT key is near the Cmd key which is on the left of the space bar. Yes, just the ALT key and nothing else. Making A Usb Bootable Operating System How To Make AThis process can work for other Macbook Pro versions too.Leave a comment below if you found this guide useful or want to clear anything I missed, thanksThis is the end of the guide on how to make a bootable Mountain Lion USB Install Drive. You can now repeat this process at any time to reinstall OS X on your Macbook Pro without needing an internet connection. You Macbook Pro will restart when the process is complete.Congratulations! You have used a Bootable USB Flash Drive to Install Mountain Lion OS X.
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