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Goto the boot menu 3. Make sure your dvd drive is your first boot device 4. Hit f10 to save and exit bios 5. Insert dvd and reboot 6. When it says 'press any key to boot from cd' hit a key 7. Follow the prompts and instructions throughtout installation 8. Aug 28, 2014 Mac OS X 10.8 Mountain Lion ISO Untouched OS download August 28, 2014. If you have a Mac, you've probably been anticipating the release of OS X Mountain Lion. If you have multiple Macs, you've probably been dreading the long process of downloading and installing it on all of them. Here's how to create a bootable backup disk and save yourself some time. Before You Start. MacOS X 10.8.5 Mountain Lion.iso. MacOS X 10.8.5 Mountain Lion.iso (6.00 GB) Choose free or premium download. FAST INSTANT DOWNLOAD.

On every OS X 10.8 Mountain Lion there is a hidden partition to enable a method for Mountain Lion OS to be reinstalled on the machine, it is known as the Recovery Partition or drive and is 650mb in size.

Jul 07, 2020 A broken Mac computer with Mac OS X or macOS (version 10.12 or later). A trial copy of the TransMac software. One high quality USB flash drive with 16GB of storage. A copy of Apple’s macOS (DMG file). Create macOS bootable USB installation media. To create a bootable USB drive. Apple computer with Mac App Store (OS X 10.6.8+)-Install OS X Mountain Lion (10.8).app (download it from Mac App Store)-User Administrative Account If you have these four things you can go on with the process. The first step it’s about inserting the USB drive into the device (Mac) and then pressing the Disk Utility button. Dec 24, 2012 If you want to use the USB to format a new computer or re-format your current computer, there are 2 ways of getting it installed. One is to go to System Preferences - Startup Disk - and select the USB drive. This will load up the Mac OS X Mountain Lion. To create an Apple Mountain Lion bootable USB Installation you will need PowerISO and an Apple OS X installation in ISO format. Download And install PowerISO; Create a Mountain Lion bootable USB installation. Open PowerISO and continue unregistered. Click on the Tools Menu and select “Create Bootable USB Drive” Select Source image file.

If you bought a new machine from Apple you have OS X 10.8 already installed – but no back up disk! and since you haven’t bought the OSX Lion 10.8 App from the App store you can’t re-download it – so thats why you have the recovery drive as a partition in your main hard drive, to boot from it you need to restart the machine and when it starts to boot hold down “command” + “r” keys.

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.

You can make a bootable USB drive or disk from the Recovery Partition 2 ways – the easy way and on the Terminal

The Easy Way

1) Download OSX Recovery Disk Assistant and uncompress and launch it

2) Attach the USB drive that you want to copy the Recovery Partition to.

3) Select the drive and continue (All contents on it will be erased)

That’s it one external bootable Recovery Drive – this works on both OSX 10.7 and 10.8

The Terminal Way

1) Launch Terminal from /Applications/Utilities and run:

The main drive in this list is No.2 with the “Identifier” of disk0s2, the boot Recovery HD drive is disk0s3

We can also identify the Recovery drive by the name and the size – set at 650mb

2) Mount the drive by its Identifier:

Output should be:

Now the Recovery HD is mounted in the Finder and you can see it in the sidebar under Devices
Navigate to it from the sidebar – Recovery HD/com.apple.recovery.boot/BaseSystem.dmg

recovery-finder-osx-lion

3) Doubleclick BaseSystem.dmg to mount it also in the sidebar. This will mount the volume ” Mac OSX Base System”

macosx-basesystem

4) Open Disk Utility in /Applications/Utilities

5) Put in a 2GB+ USB drive, let Disk Utility load it. The USB drive needs to be formatted as Mac OS Extended Journaled, if its not, its time to format it in Disk Utility…

6) Finally in still in Disk Utility, select the “Restore” tab – drag the mounted volume “Mac OSX Base System” into the Source field and drag the USB drive “Volume” (mine is called SuperBootUSBDrive) to the Destination.

restore-volume-osx-usb

7) Click Restore – 10 minutes later – One bootable USB drive

Your bootable USB drive will be called “Mac OS X Base System” after the restore is complete. Now to boot from it just select it as the Start Up disk in System Preferences or hold down option key on boot and select it from the choice of bootable devices.

If you have downloaded the OSX 10.8 Mountain Lion App from the App Store then you can also make a full bootable image of OSX 10.8 to a disk/drive, you need to make the boot drive/disk before you install the Mountain Lion App, as the installer is deleted after running it. That’s why the guide here can get you out of trouble.

Update For Newer Models – hidden BaseSystem.dmg – BaseSystem.chunklist

How To Make Mac Os Bootable Usb

If you have the latest models from Apple that came already shipped with OSX 10.7, then you may not have the “BaseSystem.dmg” but instead see a “BaseSystem.chunklist” , the “BaseSystem.dmg” is there it’s just hidden.

To show it so you can see it in the finder – go to Terminal – and after you have mounted the Recovery Drive:

Now it will be visible in the Finder.

Make Mac Os Usb Installer

Apple Mac OS X Lion is now available to general public. The Mac OS X 10.7 Lion is available for installation only from the Mac App Store. This guide will teach you how to create a bootable USB Flash drive of Mac OS X Lion 10.7 and install Lion from USB, rather than downloading it from Mac App Store on each and every Mac computer you own.

Despite of numerous great and awesome features, Mac OSX Lion 10.7 has a big flaw that it is not available in bootable USB or DVD right now. Every time you you want to install OSX Lion on a Mac you will need to download it from Mac App Store all over again. Thanks to the bootable USB method which eliminates the downloading of Mac OS X Lion for each and every device and lets you install Mac OS X Lion on any Mac.

Note: An official bootable USB of Mac OSX ion 10.7 will be available in August 2011 for $69. This method not only eliminates the wait for the official, it also saves you $40 (Mac App Store version costs $29).

Creating a bootable Mac OS X Lion 10.7 USB Flash drives requires medium level Mac knowledge, however, by following these simple instructions even a beginner should be able to install Mac OS X Lion via USB Flash Drive.

Why make a bootable Lion USB drive?

You can perform a clean OS X Lion installation with the bootable USB drive
The bootable Lion USB drive becomes a recovery disk with Disk Utility access, access to Time Machine backups, re-installation, and all other Recovery HD partition features
You will have external media to recover and reinstall Lion in the event of total drive failure or some other catastrophe

Required Stuff

Purchase and Download Mac OS X Lion from the App Store
4GB USB Flash drive (8GB recommended)

If you have arranged the above mentioned items, simply follow the detailed guide below to create a bootable Mac OS X Lion 10.7 USB Flash Drive…

Step 1 – Locate the Lion InstallESD.dmg file

Once the Lion downloading is complete, go to the Applications folder and find the Install Mac OS X Lion.app file you just downloaded;
Right click on the Install Mac OS X Lion.app file and select Show Package Contents;

Now go to Contents > SharedSupport directory. Locate the file named: InstallESD.dmg and copy it on your desktop.

Step 2 – Format The USB

Before formatting, If you have any data on your USB drive then save it;
Plug the USB flash drive into your Mac;
Launch Disk Utility from Applications;
Select the plugged USB from the Left pane on the Disk Utility and click on Partition tab;
Select 1 Partition from the Volume Scheme dropdown menu;
Input a name for the USB and Choose Mac OS Extended (Journaled);
Now click on Options button at the bottom. Select GUID Partition Table and click OK. Now click on Apply at the bottom right to start formatting.

Step 3 – Make Mac OS X Lion Bootable USB

Double-click on InstallESD.dmg (that you copied onto your Mac desktop) to mount the Lion disk image (mounted InstallESD.dmg should appear on Disk Utility application and desktop);
Select the plugged USB from the Left pane on the Disk Utility and then go to Restore tab;
Click and drag the IMac OS X Install ESD from the left pane and drop it in the Source field;
Then Click and Drag the USB drive from the left pane and drop it in the Destination field;
Make sure you have chosen the right USB drive, you don’t want to format the wrong drive and then click on Restore button;
This will restore the Lion 10.7 image to the USB Flash drive. Wait for the process to complete.

Step 4 – Boot Mac OS X Lion from USB

Reboot your Mac with the USB drive plugged in.
Hold down the alt/Option key on your keyboard when you hear the OS X start-up sound.
Choose the USB Flash Drive from there to boot.
Now follow the on screen instructions to install OS X Lion.

You can follow the Step 4 to install Lion on other Macs with the bootable USB you just created.

[via Lifehacker]

Make Bootable Usb Drive Mac Os X Mountain Lion Size