make usb bootable for mac os x installing

Make Usb Bootable Ing Mac OS X 10

On my 13 inch Macbook Pro Retina, the macOS Sierra installer turned the fan on to maximum for the whole duration of the installation.

Below are the steps I took to create the bootable USB flash drive and how I used it to install macOS Sierra.

The best advice for installing macOS Sierra is to try again and be very patient (if you expect an operation to complete in 5 minutes, then give it at least 50 minutes).

Run the App Store application, search for macOS Sierra, and download it.

It will save the installer as an ApplicationsInstall macOS Sierra.app file (about 4.97GB in size).

To keep that file, you will want to move it out of the Applications folder so it wont be deleted after an upgrade.

Launch the Terminal application and run this command to move the downloaded installer to your users Downloads folder.

This is because the script we run to create the bootable drive will reformat the flash drive as an initial step.

Click the Erase button in the warning popup dialog if you get one.

Or you can run Erase twice; the first time will unmount the partition and fail, and the second time will actually do the format (which will succeed).

The command becomes just createinstallmedia volume VolumesMojave.

Make Usb Bootable Ing Mac OS X 10

Instead, create the USB installation drive manually using instructions from Bootable USB Flash Drive to Install Mac OS X 10.10 Yosemite.

This step took 20-30 minutes with my Kingston 16GB USB 2.0 flash drive.

Yours may take a shorter or longer time.

I recommend giving it at least an hour, maybe two, before giving up.

Initially, I used a Corsair 32GB USB 3.0 drive; however, when I held down the Option key to try to boot with it, the Mac would freeze with a black startup screen.

So if you enounter issues (when erasing and copying) or weirdness (when booting), consider changing to another brand of USB flash drive.

If you dont have another drive, consider at least testing the flash drive to make sure it is not bad or corrupted (First Aid in Disk Utility is the minimum; google for more powerful tools).

Sometimes the progress bar may appear to be frozen just be patient.

I would give it at least 30-60 minutes to load before giving up.

For mechanical hard drive, it may several minutes to hours, depending upon the size, speed, and condition of your hard drive.

A popup confirmation window will appear; click on the popups Agree button.

Make Usb Bootable For Mac Os X Installing