OS X 10.7 Lion did away with recovery disks, and these days, Apple provides a built-in recovery system within Yosemite. Start your Mac and hold Command + R to go into recovery mode, from which you can start Disk Utilities, restore from a Time Machine backup, or perform a clean install. This recovery system is stored on a hidden partition on your Mac’s hard drive — but what if something happens to your hard drive? Well, if your Mac can’t find the recovery partition but it’s connected to the Internet via either Wi-Fi or a network cable, it’ll start the OS X Internet Recovery Feature. However, if your Mac is not online, or if you’ve upgraded an older Mac to Yosemite, that method won’t work. The simplest solution is to put an external USB drive or SD card into service using the OS X Recovery Disk Assistant. Once the process is finished, you’ll have a working macOS High Sierra bootable USB install disk that can be used to install macOS High Sierra beta on any Mac that supports it. To create a recovery disk, you need a USB flash drive or an external hard drive that has at least 1GB free space. You’ll also need access to a Mac running Yosemite that includes an existing Recovery HD partition. ![]() The steps below show how to download the Recovery Disk Assistant and create a recovery disk. Should you need to use it, you can then boot from this disk before restoring from a backup or reinstalling OS X. Get the Assistant If the Recovery Disk Assistant isn’t already in your Applications/Utilities folder, download it from. Once the download is complete, double-click the file called “RecoveryDiskAssistant.dmg” in your Downloads folder, then drag the resultant Recovery Disk Assistant.app into your Applications folder. Select Drive Insert a USB drive or attach an external hard drive, launch Recovery Disk Assistant (yes, it still has the OS X Lion image), agree to the terms, and wait while external drives are detected. Select the USB or external drive, then click Continue. Note that all data on this drive will be erased so that the assistant can install the files to make a recovery disk. ![]() Eject and Keep When the process is complete and you see the appropriate message that tells you so, click Quit, eject the disk, and store it in a safe place. Should you need to use it to recover your computer, make sure the disk is connected, hold Option as you restart, then select the recovery disk from the list of drives. It’s a good idea to refresh this disk every now and then. Image via Before You Start The obvious first step here is to. But before you do anything else, a word of caution: once you've used the OS X installer, it will automatically delete the file you need to make the backup disk, so you'll want to either make a copy of the installer or create your disk before you upgrade. You can use a USB flash drive, external hard drive, or DVD-R disc, but the USB drive is quicker. If you're using a USB drive, it has to be formatted as 'Mac OS Extended (Journaled)' and set to partition type 'GUID Partition Table' in order to work. Image via Once inside, browse to the ' Contents > SharedSupport' folder where there will be a file called ' InstallESD.dmg.' This is the image file that contains the information you need to create the backup disk. Step 2: Open Disk Utility (located in your Applications > Utilities folder). Step 3: Drag and drop the ' InstallESD.dmg' into the list of drives on the left and select it. This should make it appear in the Source box on the right. If not, you may have to click the ' Restore' tab as seen below. Google apps sync calendar. • Fixed an issue where users couldn’t disable context menu items on macOS • Fixed an issue where some USB devices weren’t detected by Backup and Sync. Version 3.43.1584.4446: Note: As of this version, Backup and Sync won’t start on OS X 10.9 Mavericks. Older versions of Backup and Sync still run on 10.9 Mavericks, but are no longer supported. Users will be prompted to upgrade to 10.10 Yosemite or newer.
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