For most people, this is Mac's startup drive. Performing a clean install of OS X Mountain Lion erases all the data on the target disk. It contains a bootable system with utilities for performing basic disk repair, as well as the ability to reinstall the OS if necessary. This is a hidden partition created by the Mountain Lion installer. 650MB of free space for the Recovery HD partition.A minimum volume size of at least 60GB provides sufficient room for the OS, user data, apps, and some free space. You can squeeze Mountain Lion onto a smaller drive, but there won't be much space left for user data and applications. The target volume must be at least 8GB in size. You also need a Mac running OS X Snow Leopard (10.6) or later to access the Mac App Store. Follow the instructions in the below link for the OS X. When the Utilities Menu appears select Disk Utility and click on the Continue button. Select the Recovery HD and click on the arrow button below the icon. The OS X Mountain Lion minimum requirements guide lists the Macs that can run Mountain Lion, as well as recommendations beyond the minimum. Check compatibility Mac OS X Snow Leopard 10.6.6 or later or Mac OS X Lion 10. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. For some older Macs this won't necessarily be the latest OS, such as MacOS Ventura or Monterey, but instead MacOS Catalina, for example.Screen shot courtesy of Coyote Moon, Inc. Your computer should then install the latest version of OS that it can install. Re-install MacOSX: click on " Reinstall Mac OS X" > "Continue".Select the Mac OS Extended (Journaled), give a name to your disk and click on Erase.final step do some optimize and wait for. You are asked to select the disk where to install macOS during the installation process, however it is blank or not showing. restart mac and press alt button start usb erase one more time hdd disk and install el capitan os. here is my solution steps: download el capitan os x (dmg file) copy image to usb and create bootable usb for mac. Select the startup disk and go to the Erase Tab. Back in the days before Mac OS X Lion launched in 2011 there wasn’t a Recovery partition, instead you needed to have a physical disc with the software on it and an optical drive to insert it into. hi everyone finally i solved problem and i have beautiful clear and perfect mac pro 2010.Select " Disk Utility" and click on Continue.Turn your Mac on, while holding the CMD + R keys down.Also, it is advised to make a time machine back up of your computer if possible before following the procedure. Apple Recovery lets you install onto an erased partition, but only if Recovery wasn’t erased, too Because Recovery didn’t work, the fastest way to install fresh is to make or borrow a. Mac-s-os-without-an-installation-disc" style="text-align: justify ">To reinstall your Mac's OS without an installation disc you need to firstly make sure that you keep your Mac turned on during the whole procedure, and that your Mac is connected to the internet. In this article we will show you how to reinstall Mac OS without disc. If you booted from a USB disk, click 'Continue' to advance to the installer. If you booted from a functioning recovery partition, click the 'Reinstall macOS' button to get started. MacOS includes a recovery partition that allows you to easily erase all data on your Mac and reinstall your OS without an installation disc. With your drive wiped clean, you are now ready to reinstall macOS.
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