![]() If you are erasing sensitive or confidential data on the external hard drive while formatting it, you can also click on Security Options which allows you to select how many times you want to overwrite the data.When you’ve chosen the file format you want, you can then enter a name for the drive that you’d like to appear when you use it on your Mac such as “Backup Drive”.You can find more information about all the different formats available here. If you want to use the external drive with your Mac and a Windows PC, choose ExFAT. In summary, if you’re going to use the external drive only with Apple devices such as your Mac and you’re using High Sierra or later, just select APFS. – MS-DOS (FAT) and ExFAT which is compatible with both macOS and Windows but MS-DOS (FAT) can only transfer files smaller than 4GB and is rarely used anymore. Mac OS Extended (Case Sensitive) means folders on the drive will be case sensitive so “Mac” and “MAC” would be considered two different folders. Mac OS Extended (Journaled Encrypted) means you’ll need a password to access the drive. – Mac OS Extended (Journaled) is also known as HFS+ which is used by macOS 10.12 Sierra or earlier. If APFS does not appear in the list of formatting options, you must first format the drive in Mac OS Extended Journaled first (see below) and then APFS will appear from the list of drop-down options as long as you are using macOS 10.13 High Sierra or later. APFS Encrypted means you’ll need a password to access the drive. APFS (Case Sensitive) means folders on the drive will be case sensitive so “Mac” and “MAC” would be considered two different folders. – Apple File System (APFS) which is used by macOS 10.13 High Sierra or later and is the format required by Time Machine to backup your Mac to an external drive. When you click Erase, a format menu will pop-up with three main choices with sub-formats: Click on Erase to start the formatting the external hard drive. ![]() In the left-hand margin, click on the external hard drive you have connected and in the main window, you’ll see information such as the drive name, capacity and connection type.Data about the drive will appear in the main menu including the name, size and connection type. Click on the View slide-button at the top to show all devices that are connected to your Mac.Open Disk Utility in macOS by searching for it in Spotlight or going to Applications > Utilities > Disk Utility.If it doesn’t have its own power pack then it will be powered by your Mac’s Thunderbolt or USB port. Make sure your external hard drive is connected to your Mac and plugged in if it has its own power supply.To format an external hard drive on a Mac, please follow these instructions: Important Note: Reformatting an external hard drive will erase any data on it so if you have any important files that you want to save, you must save them onto your Mac or elsewhere if you want to keep them. ![]()
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