While most external hard drives are already designed to work for Windows computers, there are times when you need to reformat one. You might want a drive that works with Macs and PCs, or maybe you want to partition it, which will split it up into two different formats. Here's how to format an external hard drive for Windows 10 or partition it.
How to Format a Hard Drive for Windows 10
Note: Formatting your drive will erase all the existing files on it. So if your external hard drive already has important files on it, make sure to back them up before proceeding.
- Connect your external hard drive to a Windows computer. If your external hard drive is working, your computer will automatically detect it, and the drive will appear under Devices and Drives next to your internal drives in the This PC window. You can also find it in the left sidebar of File Explorer.
Note: If you already used your external hard drive on a PC, be sure to back up any files on it. Formatting your drive will wipe out all the data in it.
- Right-click on the external hard drive and click Format.
- Choose a format under File System. By default, Windows computers will choose NTFS (New Technology File System) for you because that's the native Microsoft filing system. But if you want the external hard drive to also work on a Mac, you should choose exFAT.
Note: The exFAT file system only works on Mac 10.6.5 or later, and Windows XP SP3 or later.
- Check the Quick Format box, and click Start. Depending on the size of the drive, and if there are files to be deleted in it, this can take a few to several minutes to finish.
- Click OK when the Format Complete pop-up screen appears.
Some users want to free up some space on their Mac, so they move iTunes movies/TV shows to their external hard drives. You can save iTunes movies on external hard drive, but you still can not play the movies without iTunes. You will find that it is really inconvenience. The Best Format for External Hard Drives. If you want to format your external hard drive to work with Mac and Windows computers, you should use exFAT. With exFAT, you can store files of any size, and use it with any computer made in the last 20 years. Now that you know which format to use, check out our guide on how to format your hard drive on.
Now you have a hard drive formatted for Windows, but what if you wanted to use it with Mac computers also? One easy way to have a hard drive that works with Mac and Windows is by partitioning it. This means you're splitting the drive into two formats, one for Mac and one for PC. Here's how to do that:
How to Partition an External Drivein Windows 10
- Open the Windows search box, type 'diskmgmt.msc,' and hit enter. The Windows Search Box is the magnifying button icon in the bottom-left corner of your screen.
- Right-click on your external hard drive and select Shrink Volume. If this option is not available to you, reformat the drive to NTFS and try again.
- Enter an amount of space that you want to shrink your volume by. The remaining space will be displayed in megabytes.
- Then click Shrink. This will split the hard drive, with one part becoming unallocated space.
- Right-click the unallocated space on your drive and select New Simple Volume.
- Click Next.
- Then indicate how big you want the partition to be. If you want to use the rest of the space, enter the maximum disk space indicated above it. Then click Next.
- Next, choose what drive letter you want to use. Letters that have already been assigned to other drives will not be on this list, so don't worry if there are missing letters. Just choose among the drive letters still available.
- Go to File System and choose a format. Windows will choose NTFS for you because that's Microsoft's native filing system. But if you want the external hard drive to also work on a Mac, you should choose exFAT, which is an upgraded version of FAT32.
Note: The exFAT file system only works on Mac 10.6.5 or later, and Windows XP SP3 or later.
- Check the Quick Format box, and click Next.
- Finally, click Finish. If a pop-up appears telling you to format the disk, click Format Disk. After that, the newly formatted disk will open automatically.
Partitioning your external hard drive will enable you to perform tasks in one section without affecting the rest of the drive. If you want to know how to format a hard drive for Mac, check out our previous article here.
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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.
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.
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How to erase your disk
- 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
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- 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
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
Apple wireless keyboard for select mac computers. 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.