Format mac new hard drive for os install1/21/2023 ![]() ![]() ![]() ![]() You'll see the MacOS Utilities window choose "Disk Utility." Now you can choose to erase your startup drive, and choose "Mac OS Extended (Journaled)" as the operating system. To get around that problem, hold down the Command + R keys when you turn on your Mac and let go when the logo appears. If you have an external enclosure for the old hard drive, you will plug that in via Firewire or USB, (Note: USB is only a bootable option on Intel Macs) then turn on your computer while holding down the Option key on your keyboard. If you want to format your Mac's system drive, you can't do that when the Mac is running normally because the drive is in use by the operating system. After you install the new hard drive, you will need to boot to your old hard drive. Usually, you'll want ExFAT, which is the default for the MacOS. Select the drive you want to format and then choose “Erase.”Ĥ. At the top of the window, click "Erase."ĥ. In the pop-up window, choose the file system you want to use. ![]()
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