This was created for those of you that would rather skip all the hassles of installing a fresh OS onto a newly formatted volume. This virgin OS has never been booted yet and will require you to create a user account. To restore this onto a Mac GUID partitioned volume: Use Apple's Disk Utility to restore it to a fresh volume or your favourite disk copying tool.

OS X Mountain Lion (version 10.8) is the ninth major release of OS X (now named macOS), Apple Inc.'s desktop and server operating system for Macintosh computers. OS X Mountain Lion was released on July 25, 2012 for purchase and download through Apple's Mac App Store, as part of a switch to releasing OS X versions online and every year, rather than every two years or so. Named to signify its status as a refinement of the previous Mac OS X version, Lion, Apple's stated aims in developing Mountain Lion were to allow users to more easily manage and synchronise content between multiple Apple devices and to make the operating system more familiar.

The operating system gained the new malware-blocking system Gatekeeper and integration with Apple's online Game Center and iCloud services, while the Safari web browser was updated to version 6. As on iOS, Notes and Reminders became full applications, separate from Mail and Calendar, while the iChat application was replaced with a version of iOS's Messages. Mountain Lion also added a version of iOS's Notification Center, which groups updates from different applications in one place.

MessagesSend messages from your Mac to friends with an iPhone, iPad, or Mac.With iMessage, you can start a conversation on your Mac and pick it up on your iPhone or iPad.Messages also supports traditional instant messaging services like AIM, Yahoo! Google Talk and Jabber.
iCloudDocuments in the Cloud lets you create and edit your documents on your Mac, iPhone, and iPad.The new Reminders app makes managing tasks easy. Jot down your thoughts with the new Notes app. And iCloud keeps your Reminders and Notes up to date across all your devices.
SafariType both searches and web addresses in the new Smart Search Field.Pinch to see tabs with Tab View and swipe to switch between them.iCloud Tabs makes the last websites you looked at accessible on your iPhone, iPad, and Mac.
Notification CenterNew notifications appear in the top right corner of your screen.Open Notification Center from anywhere in OS X to see recent notifications.Configure your notifications to receive just the ones you want.
SharingShare links, photos, videos, and other files right from the app you're in.Share with Mail, Messages, and AirDrop.Sign in to Twitter, Flickr, and Vimeo once to start sharing.Tweet right from your apps with the Tweet sheet.
Game CenterPlay live multiplayer and turn-based games against friends on iPhone, iPad, iPod touch, or Mac.Log in to the Game Center app to see friends in your gaming network.Check out leaderboards and achievements.See what games your friends play and track your progress against them.
Other great Mountain Lion features
Dictation lets you talk anywhere you can type-no setup or training required.
AirPlay Mirroring shows your Mac screen on your HDTV with Apple TV.Power Nap keeps your Mac up to date while it sleeps so it's instantly ready to go.Gatekeeper makes it safer to download apps from the Internet by giving you control over which apps can be installed on your Mac.New features for Chinese users include improved text input, leading search engine Baidu as an option in Safari, sharing to microblogging service Sina Weibo and video websites Youku and Tudou, eight new fonts, and a new Chinese dictionary.
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