![]() OS X Mountain Lion was officially announced by Apple on their website on February 16, 2012, as a successor to Mac OS X Lion. OS X Mountain Lion was announced at WWDC 2012 at Moscone West. The same practice was also applied to its predecessor, Mac OS X Lion. Apple later allowed free downloads of the OS, especially for customers of older and no longer officially supported Macintosh computers, starting on June 30, 2021. Mountain Lion was the last paid upgrade for an OS X major release, with OS X Mavericks and later being free. ![]() Mountain Lion sold three million units in the first four days, and has sold 28 million units as of June 10, 2013, making it Apple's most popular OS X release. ![]() OS X Mountain Lion received positive reviews, with critics praising Notification Center, Messages, and speed improvements over Mac OS X Lion, while criticizing iCloud for unreliability and Game Center for lack of games. It was released as a downloadable update later. Facebook integration was also planned but unfinished at launch date. Integrated links allowing the user to rapidly transfer content to Twitter were present in the operating system from launch. Mountain Lion also added a version of iOS's Notification Center, which groups updates from different applications in one place. 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. 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. Named to signify its status as a refinement of the previous 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. 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. With the drive restored, you can now boot to it by either holding the C key down at start-up with the DVD in the drive, or to select a non-DVD boot drive, then start up with the Option key held down, and select the installation drive when it shows up.OS X Mountain Lion (version 10.8) is the ninth major release of macOS, Apple Inc.'s desktop and server operating system for Macintosh computers. If you run into any errors, try formatting the drive first and then drag the formatted volume to the Destination field instead of the entire drive device. Then click the Restore button and confirm you wish to delete the drive and restore the image to it. Then ensure it is in the Source field (drag it there if it is not), and then drag your drive of choice from the Disk Utility sidebar to the Destination field. To restore to a drive, select the Disk Image and click the Restore tab. Insert a blank disc when the burn dialog displays, and then click Burn (be sure to have Disk Utility verify the burn to ensure the media works as it should). To burn the image to DVD, select it in the sidebar and click the Burn button in the Disk Utility toolbar. ![]() Screenshot by Topher Kessler/CNETÄrag the disk image to the Disk Utility sidebar Using Disk Utility you can either restore the image to a healthy disk partition (steps 1, 2, and 3), or you can burn it to DVD (step 4) to have it on an optical disc (click for larger view).
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