Erasing your disk: For most reasons to erase, including when reformatting a disk or selling, giving away, or trading in your Mac, you should erase your entire disk.
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Erasing a volume on your disk: In other cases, such as when your disk contains multiple volumes (or partitions) and you don't want to erase them all, you can erase specific volumes on the disk.
Erasing a disk or volume permanently deletes all of its files. Before continuing, make sure that you have a backup of any files that you want to keep.
How to erase your disk
Buying and using an external HD is one thing, getting the most out of it is quite another. In this guide, we'll show you how to format an external hard drive so you can not only get rid of the. Part 1: Two methods to format external hard drive on Mac Method I: Format an external hard drive through 'Disk Utility' (newbie friendly) Step 1: Connect the external hard drive with your Mac, and the computer will mount your external hard drive. Click here when external hard drive does't mount on Mac.
- The Best Format Choice of External Drive on Mac. Using the external drive on Mac is a good idea as it provides additional storage. But it is hard to pick a suitable format as it depends on your usage. So, it is better that you know your options and understands which format is right for you. So, here are the best formats for an external.
- Tips for Formatting a Hard Drive on Mac: Even though formatting doesn’t seem like a big deal, still it can be very helpful. So, you must stay active and keep all things in mind. Here are some tips that might help you when you are about to format a Mac hard drive.
- To format an external hard drive for Mac with Time Machine, you must follow the steps below. Step 1 Open Finder, Applications, then go to Utilities and Disk Utility. Step 2 Follow the steps above to format the drive, and then you can use it with Time Machine on your Mac system.
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the disk your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - Choose View > Show All Devices from the menu bar in Disk Utility. The sidebar now shows your disks (devices) and any containers and volumes within them. The disk your Mac started up from is at the top of the list. In this example, Apple SSD is the startup disk:
- Select the disk that you want to erase. Don't see your disk?
- Click Erase, then complete these items:
- Name: Type the name that you want the disk to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- Scheme: Choose GUID Partition Map.
- Click Erase to begin erasing your disk and every container and volume within it. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the disk you erased, reinstall macOS on the disk.
How to erase a volume on your disk
- Start up from macOS Recovery. Then select Disk Utility from the Utilities window and click Continue.
If you're not erasing the volume your Mac started up from, you don't need to start up from macOS Recovery: just open Disk Utility from the Utilities folder of your Applications folder. - In the sidebar of Disk Utility, select the volume that you want to erase. The volume your Mac started up from is named Macintosh HD, unless you changed its name. Don't see your volume?
- Click Erase, then complete these items:
- Name: Type the name that you want the volume to have after you erase it.
- Format: Choose APFS or Mac OS Extended (Journaled). Disk Utility shows a compatible format by default.
- If you see an Erase Volume Group button, the volume you selected is part of a volume group. In that case, you should erase the volume group. Otherwise, click Erase to erase just the selected volume. You might be asked to enter your Apple ID. Forgot your Apple ID?
- When done, quit Disk Utility.
- If you want your Mac to be able to start up from the volume you erased, reinstall macOS on that volume.
Reasons to erase
Best dvd encoding software. You can erase at any time, including in circumstances such as these:
- You want to permanently erase all content from your Mac and restore it to factory settings. This is one of the final steps before selling, giving away, or trading in your Mac.
- You're changing the format of a disk, such as from a PC format (FAT, ExFAT, or NTFS) to a Mac format (APFS or Mac OS Extended).
- You received a message that your disk isn't readable by this computer.
- You're trying to resolve a disk issue that Disk Utility can't repair.
- The macOS installer doesn't see your disk or can't install on it. For example, the installer might say that your disk isn't formatted correctly, isn't using a GUID partition scheme, contains a newer version of the operating system, or can't be used to start up your computer.
- The macOS installer says that you may not install to this volume because it is part of an Apple RAID.
About APFS and Mac OS Extended
Disk Utility in macOS High Sierra or later can erase using either the newer APFS (Apple File System) format or the older Mac OS Extended format, and it automatically chooses a compatible format for you.
How to choose between APFS and Mac OS Extended
Disk Utility tries to detect the type of storage and show the appropriate format in the Format menu. If it can't, it chooses Mac OS Extended, which works with all versions of macOS. If you want to change the format, answer these questions:
- Are you formatting the disk that came built into your Mac?
If the built-in disk came APFS-formatted, Disk Utility suggests APFS. Don't change it to Mac OS Extended. - Are you about to install macOS High Sierra or later for the first time on the disk?
If you need to erase your disk before installing High Sierra or later for the first time on that disk, choose Mac OS Extended (Journaled). During installation, the macOS installer decides whether to automatically convert to APFS—without erasing your files. - Are you preparing a Time Machine backup disk or bootable installer?
Choose Mac OS Extended (Journaled) for any disk that you plan to use as a Time Machine backup disk or as a bootable installer. - Will you be using the disk with another Mac?
If the other Mac isn't using macOS High Sierra or later, choose Mac OS Extended (Journaled). Earlier versions of macOS don't work with APFS-formatted volumes.
How to identify the format currently in use
If you want to know which format is currently in use, use any of these methods:
- Select the volume in the Disk Utility sidebar, then check the information shown on the right. For more detail, choose File > Get Info from the Disk Utility menu bar.
- Open System Information and select Storage in the sidebar. The File System column on the right shows the format of each volume.
- Select the volume in the Finder, then choose File > Get Info from the menu bar. The Get Info window shows the Format of that volume.
If your disk or volume doesn't appear, or the erase fails
- Shut down your Mac, then unplug all nonessential devices from your Mac.
- If you're erasing an external drive, make sure that it's connected directly to your Mac using a cable that you know is good. Then turn the drive off and back on.
- If your disk or volume still doesn't appear in Disk Utility, or Disk Utility reports that the erase process failed, your disk or Mac might need service. If you need help, please contact Apple Support.
Learn more
- If you can't start up from macOS Recovery, you can use a different startup disk instead.
- If Disk Utility shows a Security Options button in the Erase window, you can click that button to choose between a faster (but less secure) erase and a slower (but more secure) erase. Some older versions of Disk Utility offer the option to zero all data instead. These secure-erase options aren't offered or needed for solid-state drives (SSDs) and flash storage.
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If you buy an external drive—such as one of our recommended desktop hard drives, portable hard drives, or USB 3.0 flash drives—you may need to reformat it to work with your operating system of choice, since different operating systems use different file systems to process data.
Although it’s true that any drive is compatible with both Windows and macOS, most drives come preformatted for Windows out of the box. If you use Windows, chances are good that you won’t need to reformat your external hard drive—unless you buy it secondhand, or you plan on switching between operating systems, your drive should come ready to use. If you use a Mac, the likelihood that you’ll have to reformat the drive is higher. But fear not: The process is simple.
Choosing the right format for your drive
Non-Linux computers can use four main file systems: NTFS, HFS+, FAT32, and exFAT. So what do those four file systems mean, and which one is right for you?
- If you plan to use your drive for File History backups on a Windows computer, and you use only Windows, stick to NTFS (New Technology File System). NTFS is native to Windows, and most hard drives are preformatted for this file system. macOS and Linux, however, can only read files stored on such a drive; they cannot write to an NTFS-formatted drive. NTFS has huge file and partition size limits that you won’t hit; that makes it a better choice than FAT32, which has a 4 GB size limit per file. Many backup archives and video files are larger than 4 GB.
- If you plan to use your drive for Time Machine backups on a Mac, and you use only macOS, use HFS+ (Hierarchical File System Plus, or macOS Extended). A drive formatted this way will not mount on a Windows computer without additional software. Like NTFS, the HFS+ file system has file and partition size limits that are much bigger and more suitable for modern use than those of FAT32.
- FAT32 (File Allocation Table 32) is an older file system that both Windows machines and Macs still support. FAT32 was introduced in Windows 95 in 1997, but it remains useful because nearly every system can use it. Unfortunately, it isn’t any good for storing movies and other large files: FAT32 has a size limit of 4 GB per file, so your files have to be small.
- If you need to transfer files larger than 4 GB between Mac and Windows computers, exFAT (extended File Allocation Table) is the best option, although it doesn’t work with File History or Time Machine. exFAT works on both macOS and Windows, and it doesn’t have the file size limit that FAT32 does, so you’ll be able to back up movies and other large files.
- If you want to use a single external hard drive to back up both File History and Time Machine, you can partition it so that some of the drive is NTFS and some is HFS+. First, partition the drive using Disk Utility with macOS, and (using our walkthrough below) format one part as HFS+ and the other as FAT32; then, plug the drive into Windows and reformat the FAT32 portion as NTFS. Now your computer will see your single drive as multiple, smaller drives. Make sure to leave plenty of room for future backups on both partitions. It’s possible, but tricky, to change the size of a partition later on in Windows and macOS; we recommend backing up the data on your drive before attempting the task, since it’s possible to wipe your drive doing this.
Now that you’ve figured out those differences, it’s time to reformat your hard drive. Reformatting will delete all the data stored on the drive, so if you need to reformat, do so as soon as you buy the drive. If you already have data stored on the drive, back that data up elsewhere, reformat the drive, and then put your data back on the drive.
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Format External Hard Drive-in Vista
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Reformatting your drive in Windows
To reformat a drive on Windows:
- Plug in the drive and open Windows Explorer.
- Right-click the drive and choose Format from the drop-down menu.
- Select the file system you want, give your drive a name under Volume label, and make sure the Quick Format box is checked.
- Click Start, and the computer will reformat your drive.
When you’ve completed the process, you can open the external drive in Windows Explorer.
How To Format Hard Drive For Mac
Reformatting your drive in macOS
To reformat your drive for macOS:
- Plug in the drive and open the Finder.
- Click the Go menu, select Utilities from the drop-down menu, and open Disk Utility.
- Choose your external drive from the left sidebar, and click Erase.
- Give your drive a name and select the file system you want from the Format drop-down.
- Click Erase, and the system will reformat your drive.
When you’ve completed the process, you can open the external drive by clicking on the drive’s icon on the desktop of your Mac.
Note: Using the formatting options above on a drive that has data on it may not be enough to prevent some of that data from being recoverable. If you're formatting a drive in order to give it away, sell it, or recycle it, make sure to securely erase the drive to prevent data recovery.
Further reading
How To Format External Hard Drive On Macbook Pro
How to Back Up Your Computer
by Thorin KlosowskiAfter hundreds of hours researching the best local storage and online backup services, we’ve put together a guide to backing up your Mac or Windows computer.