#How to install mac os x from usb download#

Select Reinstall OS X, the second option from the list. When you are done, you will be directed back to the OS X Utilities dialogue.Note: Do this with caution and make sure you have already backup all important files and data as there will be no way for recovery from this point onwards. Click the Erase button button and everything (including files, applications, settings, etc) in your Mac will be completely deleted.At the Disk Utility screen, select your MacвЂ™s hard drive, then click Erase tab and select Mac OS Extended (Journaled) as format.You will then be taken to the OS X Utilities dialogue box.When you see the screen in the screenshot below, select Mac OS X on the right. Restart your Mac, hold down the Option key when you see the Apple logo.Now, we will attempt to remove everything from the current OS and reinstall a new copy of OS X Mountain Lion. So weвЂ™ve downloaded a new copy of Mountain Lion, copied it over to the USB drive and made it bootable. The installation may take about 10 вЂ“ 20 minutes and once it is done youвЂ™ll have yourself a USB drive with a bootable Mountain Lion. Drag the formatted drive from the left menu to the Destination field, then drag 'Mac OS X Install ESD' on the left menu to Source and click the Restore button. Now, we are going to create a bootable OS X Mountain Lion in the USB drive.Once the USB drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab.Keep a backup of the files within if you still need them, then come back to this section. Note: This will remove everything in the USB drive. Under Erase tab, select Mac OS Extended (Journaled) format and click the Erase button. Select the USB drive on the left menu, Erase tab.Plug your USB drive into your Mac and launch the Disk Utility application.Double-click InstallESD.dmg to open (or mount) it on your Desktop.Navigate to Contents > SharedSupport, then look for the filename 'InstallESD.dmg'.Look for the file called 'Install OS X Mountain Lion', Right-click and select Show Package Contents.

#How to install mac os x from usb download#

Create bootable OS X Mountain LionДЄfter your download is done, letвЂ™s proceed to making a bootable USB drive with your OS X Mountain Lion in it. Note: This may take up between 10 and 60 minutes, depending on the speed of your Internet connection.

If youвЂ™ve previously purchased a copy of Mountain Lion, donвЂ™t worry, you will not be recharged. Re-enter your App Store credentials if required.Select the volume containing the bootable installer. Release the Option key when you see a dark screen showing your bootable volumes. Look for OS X Mountain Lion, hold down the Option key and click Download. Press and hold the Option (Alt) key immediately after turning on or restarting the Mac.Launch the App Store and go to the Purchases tab.HereвЂ™s how you can download and obtain a soft copy of Mountain Lion. The installer you downloaded from the App Store automatically deletes itself after youвЂ™ve successfully upgraded (or install) your Mac. Re-download Mountain Lion InstallerДЇirst, grab hold of a copy of the Mountain Lion installer file. While I was doing maintenance for my OS X, using the Maintenance app, the app told me that. Nice job.Д«ased in Houston, David Martin is a technologist at BYTE. Install OS X Lion 10.7 just as you installed previous versions of OS X. Use this disk to boot any OS X 10.7 Lion compatible Mac. You never know when you'll need to do a fresh install. Now just wait for your new OS X Lion install USB stick to finish. The process copies the InstallESD.dmg image to the USB stick, verifies it and completes. If you are prompted for your user ID and password, enter them and hit OK. Once it appears on the Finder desktop, move its icon to the Disk Utility window. In Disk Utility, click the InstallESD.dmg icon.Д¬lick on the Restore tab. Drop it into the left-most windowpane inside of Disk Utility. Move the ESDInstall.dmg file from your Finder desktop to Disk Utility, as shown below. Double-click to open it.Дouble-click the Disk Utility icon to open it. Open the Applications folder in Finder and locate the Utilities folder. Doing so endangers the installation application. Switch to Finder and paste the file to your Desktop. Right-click the InstallESD.dmg file and hit Copy. If you backed up the installation file as instructed and don't see it here, find the backup.ДЄpple, which is selling a $70 USB install disk of its own in August, destroys this file at the completion of most installations. Here you'll find the InstallESD.dmg inside the ShareSupport folder. Inside the Contents folder you will find a SharedSupport folder.