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OSX MOUNTAIN LION INSTALL DISK MAC OS X
OSX MOUNTAIN LION INSTALL DISK FULL
OSX MOUNTAIN LION INSTALL DISK SOFTWARE

Disadvantages: requires an internet connection and new enough firmware since everything is coming over the internet, booting will be slower than with your own recovery drive (and again, reinstalling Lion will require 4GB worth of patience). Advantages: doesn't require any advance preparation as above, you can boot from this and recover from Time Machine and/or reinstall Lion (if you have enough time).

Use Lion Internet Recovery (per BJ Homer's answer).

OSX MOUNTAIN LION INSTALL DISK FULL

Disadvantages: you must create this before removing the old HD, it requires an 1GB or larger flash drive, and since it won't include the full Lion installer you'll need an internet connection (and 4GB worth of patience) to reinstall Lion with it. Advantages: you can boot from this and recover from Time Machine (and/or reinstall Lion if you have an internet connection and enough time). Create a Lion Recovery drive (per my answer above) using an existing Lion system and Apple's Lion Recovery Disk Assistant.On this page, instead of executing multiple commands in Terminal to create an ISO file, you can easily create an ISO file by copying and executing a shell script.

OSX MOUNTAIN LION INSTALL DISK SOFTWARE

Disadvantages: you need to download the installer first (around 4GB), and it requires an 8GB or larger flash drive. I think that the ISO file for macOS installation is often used with virtual environment software such as VMware and VirtualBox. Apple has released OS X Mountain Lion aka OS X 10.8 as a download from the Mac App Store only however, you can use the download to create a separate OS installation disc to save your disk space or if you want a clean installation. Advantages: just like the purchased installer, you can boot from this and reinstall Lion and/or recover from Time Machine without needing an internet connection.

OSX MOUNTAIN LION INSTALL DISK MAC OS X

Create your own Lion installer drive (per Diago's answer) using a downloaded Lion installer app. Mac OS X Lion Installer Mac OS X 10. OS X Mountain Lion Bootable Image Item Preview There Is No Preview Available For This Item.

Advantages: you can boot from this and reinstall Lion and/or recover from Time Machine without needing an internet connection.

Buy a Lion installer (USB drive) from Apple. Mac OS X 10.

There are a number of similar options that can be a little confusing, so here's an attempt at clarifying their differences: Then, after you replace the HD, you can boot from that and use it to reinstall Lion and/or recover your system from Time Machine. I'll add yet another option to the list: before you remove the old HD, use the Lion Recovery Disk Assistant to copy its recovery partition to a flash drive.