Sep 20, 2016 Take a 16GB or larger USB flash drive to create a bootable Sierra installer. This flash drive is only needed for a clean install on your Mac’s startup drive. But if you plan to clean install on a non-startup drive (you have and extra HDD or SSD on your Mac), you don't need the USB. Backup your Mac to ensure your personal data is intact. Mar 06, 2017 This will walk you through how to install macOS on a USB drive in three steps. The flash drive must be at least 8GB+ in size in order to fit the macOS installer on it. To make a flash drive installer you need a Mac or a Windows/Linux machine running Mac OS in a virtual machine. Intel: Sierra VM Ryzen: Sierra VM STEP 1: Downloading macOS Open App Store Click Store then Login from the menu bar. Pick the drive you wish to use to start up the Mac. For more advice about installing macOS or Mac OS X read How to update the Mac operating system and How to install old versions of OS X on a Mac. Congratulation: you have created MacOS High Sierra Bootable USB successfully on Windows without using any software or Mac computer. So, now go to your USB flash drive and check the MacOS High Sierra files. Therefore, now your USB drive is ready to boot MacOS High Sierra and you can install MacOS High Sierra from your USB flash drive.
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Hi there mlr99,
From what you describe it sounds like you are trying to install Lion on your newly installed HDD replacement but its not showing as a disk when you try to actually install Mac OS X. That indicates to me that the drive has not yet been formatted as Mac OS Extended Journaled, so it is not ready for Lion to install onto it. This section of the following article will help you get that drive erased and formatted properly so you can continue with the installation:
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- Before you begin, make sure your Mac is connected to the Internet.
- Restart your Mac. Immediately hold down the Command (⌘) and R keys after you hear the startup sound to start up in OS X Recovery.
- When the Recovery window appears, select Disk Utility then click Continue.
- Select the indented volume name of your startup disk from the left side of the Disk Utility window, then click the Erase tab.
- If you want to securely erase the drive, click Security Options. Select an erase method, then click OK.
- From the Format pop-up menu, select Mac OS Extended (Journaled). Type a name for your disk, then click Erase.
- After the drive is erased, close the Disk Utility window.
- If you’re not connected to the Internet, choose a network from the Wi-Fi menu.
- Select the option to Reinstall OS X.
- Click Continue and follow the onscreen instructions to reinstall OS X.
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