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When you receive the email and code, you download OS X Lion to your Mac from the App Store. Once Lion is downloaded, go to the Applications folder and find the copy of Lion. Right-click on the downloaded file and select Show Package Contents. The disk has an operating system (macOS Big Sur), and user data (apps, etc). And since you only have one disk, this is your startup disk: all 500GB. A Mac with two disks will have the storage divided between them. The Mac drive with the OS on it is the startup disk while the other drive is just used for storage of files.

How To: Dual Boot Mac OS X 10.11 El Capitan & 10.10 Yosemite How To: Create a Bootable Install USB Drive of Mac OS X 10.9 Mavericks How To: Dual Boot Mac OS X Mavericks 10.9 & Yosemite 10.10 How To: Rename Multiple Files at Once in Mac OS X Yosemite. Point to your Mac OS.dmg or.iso file by clicking the add button. After that TransMac will create bootable Mac OS USB within few minutes. Then you can insert it into your Mac, hold down the option key while turn on and boot your system with this USB. If your Mac is using a firmware password, you're prompted to enter the password. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. If your Mac is using a firmware password, you're prompted to enter the password. Option-Command-P-R: Reset NVRAM or PRAM.

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