From the Recovery Partition Hard Drivr you can run Disk Utility, access the command line, get online help and do a restore from a Time Machine backup and re-install Mountain Lion leaving all your other files intact it just replaces the core operating system.
Download macOS from the App Store.The installer weighs in at a hefty.05GB, but the good news is that you can install your copy of Mountain Lion on all of your Macs for no extra charge.Heres what youll see upon booting with the drive connected: From here you can format, restore from backups, or reinstall Lion.Identifier : diskutil mount /dev/disk0s3, output should be: Volume Recovery HD on /dev/disk0s3 mounted.Recovery drive by the name and the size set at 650mb 2) Mount the drive by its.Another reason to create a bootable copy of Mountain Lion is if you want to do a clean install.Right-click on the USB drive in Disk Utility and select Restore.
After downloading the installer, mount the USB flash drive or other volume that you're using for the bootable installer.
Restart your Mac while holding down the option key.
This is your ticket to creating a bootable copy of Mountain Lion.Terminal shows the progress as the bootable installer is created.High Sierra: sudo /Applications/Install macOS High -volume /Volumes/MyVolume.For a clean install of Mountain Lion on any compatible Mac, follow these steps: Insert your bootable disk or drive.These all assume that the installer is in your Applications folder, and the name of the volume that you're using for the bootable installer is MyVolume.If your volume is named differently, replace MyVolume with the name of your volume.3) Select the drive and continue (All contents on it will be erased thats it one external bootable Recovery Drive this safari car game for pc works on both OSX.7 and.8.The whole process should take no more than an hour on even the slowest of Macs.Now you need to set the source disk for the restore.