Power down your Mac completely. Clean Install macOS Catalina Using Internet Recovery Method. To boot into Internet Recovery, restart. Internet Recovery will download a new copy of the OS X recovery utilities from Apple's servers when a local copy isn't available. Attempting to access your local recovery partition should always be first priority but if that fails due to problems with your hard drive, Internet Recovery is the way to go.Startup Mac from macOS Recovery. In fact, because Recovery HD is a separate partition—and one that’s invisible even to Disk Utility—recovery mode would be available at startup even if you were to erase your Mac’s startup drive.Norton Remove and Reinstall tool helps to uninstall and reinstall most Norton products such as Norton Security, Norton 360, and Norton Internet Security on.Now, follow the guides below to download Macintosh HD on your Mac. On a Mac with Apple silicon, you can use macOS Recovery to repair your internal disk, reinstall macOS, restore your files from a Time Machine backup, set the security policy for different disks, transfer files between two Mac computers, start up in safe mode and more.The idea behind recovery mode is that if you ever have problems with your Mac’s startup volume, you can boot from Recovery HD and perform some basic troubleshooting procedures without the need for an OS X installation DVD or thumb drive, or a separate bootable drive. MacOS Recovery is the built-in recovery system of your Mac. (It was called Lion Recovery under Lion.) When you install Mountain Lion or Lion, the installer creates an invisible, bootable, 650MB partition—a portion of a drive the operating system treats as a separate volume—on your startup drive called Recovery HD that includes a few essential utilities for fixing problems, restoring files, browsing the Web, and even reinstalling the operating system.About macOS Recovery. A major feature that debuted in Lion (OS X 10.7) and continues in Mountain Lion (OS X 10.8) is one I hope you’ll never need to use: recovery mode, officially called OS X Recovery.Of course, because the Recovery HD partition is actually part of your Mac’s internal drive or SSD, if that drive is having hardware problems, or partition-map problems, the recovery partition itself may be inaccessible. When you see the utility window as shown below. If you need to enter a password, do as required.For starters, as Apple explains, the drive must be formatted with a GUID partition scheme and Mac OS Extended (Journaled) format, and it must be at least 13GB in size. (If the drive was previously running Lion and already has a Recovery HD partition, the Mountain Lion installer simply updates the partition’s contents.) I say “attempts” because the installer is not always successful. I also cover Internet Recovery below.Why you might not have a Recovery HD partitionWhen you install Mountain Lion on a drive, the installer automatically attempts to repartition that drive to create the invisible Recovery HD partition. Find downloads and get support.Separate from—but closely related to—OS X Recovery is a feature called Internet Recovery, which provides similar features even if your Mac’s drive is damaged or has been replaced. Shop Surface, Microsoft 365, Xbox, Windows, Azure, and more. Also, because the Recovery HD volume is read-only, you can’t, say, copy your favorite third-party disk utility onto it to make that utility available in recovery mode.Explore Microsoft products and services for your home or business.
If you were using Boot Camp, you’d then use Boot Camp Assistant to set up Boot Camp again, and then restore your Boot Camp data.Alternatively, you could install Mountain Lion on an external hard drive or thumb drive, which would create a usable Recovery HD partition on that drive. Your only option, according to Apple, is to back up your drive (including your Boot Camp partition, if you have one), erase it (repartitioning it as a single-partition, Mac OS Extended volume in the process), reinstall Mountain Lion or Lion, and then restore your data from your backup. So not everyone will get this useful feature.Unfortunately, if you didn’t already have a Recovery HD partition from a previous Lion installation, and the Mountain Lion installer can’t create the partition, you can’t add it later. Skip Internet Internet Recovery Code Stored InThis feature works much like standard OS X Recovery but with one major difference: Internet Recovery works even if you don’t have a Recovery HD partition, if that partition isn’t working properly, or if your Mac’s drive is damaged or not connected.How does Internet Recovery work? Unlike standard recovery mode, which uses software on a partition of your Mac’s drive, Internet Recovery uses a combination of code stored in your Mac’s firmware and a net-boot image stored on Apple’s servers. Alternatively, if you’ve got a wired connection, be sure the Ethernet cable or USB-to-Ethernet adapter is connected to your Mac.Macs released in mid-2011 or later, along with some older Macs once you install a firmware update, include a new feature called OS X Internet Recovery (Lion Internet Recovery under Lion). If you want to connect to your network or the Internet, and you haven’t already chosen a Wi-Fi network, you can do so using the Wi-Fi menu. After a brief delay, you’ll see the new OS X Utilities screen.(Note that this Utilities screen is the same one you’ll see if you create a bootable Mountain Lion install drive and boot your Mac from it.)OS X Recovery, also known as recovery mode, offers a number of useful troubleshooting options.Regardless of which method you used to access recovery mode, the menu bar displays OS X’s Input, Wi-Fi, and (on laptops) battery menus. However, you aren’t required to perform this step now, as you’ll also be able to choose a network once you’re booted into recovery mode.Select Recovery HD and then click the upward-pointing arrow below it to boot from Recovery HD. One of the volumes will be called Recovery HD.If you’ll want to connect to your local network (for example, to access backups on a Time Capsule) or the Internet in recovery mode (see “Using recovery mode,” below), you can use the pop-up menu at the bottom of the screen to choose a local Wi-Fi network provide the network’s password when prompted. However, in my testing, this didn’t work on every Internet Recovery-capable Mac.If that keyboard shortcut doesn’t work for you, the answer is generally, “You can’t unless you really need to.” As long as you have a valid Recovery HD partition, trying to boot into Internet Recovery will instead boot your Mac into standard recovery mode. In fact, if you boot into Internet Recovery, the first screen you see displays a slow-moving progress bar along with a warning that booting will take a while.How do you boot into Internet Recovery? If you’re really curious, you may be able to force your Mac to boot into Internet Recovery by holding down Command+Option+R at startup. Also, because Internet Recovery requires an Internet connection just to boot, if your Mac is not connected to a working Ethernet network, you’re required to connect to a Wi-Fi network right from the start.However, while Internet Recovery is a useful feature, and it could even be a metaphorical life-saver should your hard drive die, it has one major drawback: It’s very, very slow compared to standard recovery mode, because it must first download the necessary software. At that point, Internet Recovery works much like standard recovery mode, as described in the next section.One other difference between standard recovery mode and Internet Recovery is that when you boot into Internet Recovery, the system tests your Mac’s RAM and its hard drive to see if either has any obvious hardware problems. Your Mac then downloads the necessary code over the Internet and boots. Snes emulator for macSo if you previously added the System folder, or any other OS-related files and folders, to Time Machine’s exclusion list in the Time Machine pane of System Preferences, you won’t be able to restore your system from that backup using this tool. If the problems your Mac is having are serious enough that you need to erase your startup drive (perhaps using Disk Utility in recovery mode, below), or if you’ve installed a new drive in your Mac, this option lets you restore, from a Time Machine backup, your entire system, including the OS and all accounts, user data, and settings.Note that to use this feature, your Time Machine backup must be a complete backup that includes all system files. The four main options are listed in the OS X Utilities window select one and click Continue to use it.Restore From Time Machine Backup: You have a backup of your system that you want to restore. (If you have a compatible Mac with an easily accessible hard drive, you could simply disconnect your hard drive, but that’s not an option for most current Macs.)Using OS X Recovery and Internet RecoveryWhen booted into recovery mode, the tasks you can perform are limited. Only then, with a blank drive with no Recovery HD partition, was I able to boot into Internet Recovery by holding down Command+R at startup. In fact, on one of my Macs, to even test Internet Recovery I had to use a number of tricks to make my Mac’s Recovery HD partition visible and then purposely erase and remove it.
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