The process of installing OS X or macOS on a Mac hasn't changed a great deal since OS X Lion altered the delivery of the OS from optical disks to electronic downloads, using the Mac App Store.
hi im want to install an operating system from a usb and im not sure how to do it i know how to boot from a usb using this guide Press “Win + R”, type diskmgmt.msc and press the Enter button.
Look for your USB drive and remember the Disk number. In my case, the USB drive is listed as “Disk 1,” so the disk number is “1.”
Once you have the disk number, open up the Windows command prompt as administrator.
Navigate to the VirtualBox installation directory using the following command
cd %programfiles%OracleVirtualBox
Enter the following command while replacing “#” with the actual disk number. What this command does is create a VMDK file in your C drive which points to the physical USB drive.
VBoxManage internalcommands createrawvmdk -filename C:extdisk.vmdk -rawdisk .PhysicalDrive#
Once you have replaced the drive letter, the command should look something like this.
VBoxManage internalcommands createrawvmdk -filename C:extdisk.vmdk -rawdisk .PhysicalDrive1
Once you execute the command you will get a confirmation message stating the same, and you will see a new file with the name “extdisk.vmdk” in your C drive.
Now open up the VirtualBox with administrative rights. If not, VirtualBox will fail to boot from the USB drive.
Once opened, create a new virtual machine as usual. At the step when it prompts you to add a hard drive, select the radio button “Use an existing virtual hard drive file.” Click on that little folder icon and select the file we just created. Click on the “Create” button to complete the process.
![How How](/uploads/1/2/5/7/125732438/873783207.png)
You will see a new virtual machine listed in the left pane of the VirtualBox window. Just select it and click on the “Start” button located in the top menu to boot from the USB drive.
![Mac Mac](/uploads/1/2/5/7/125732438/874443396.jpg)
but i dont know how to install it please help