In order to change the partition map, it seems you have to select the actual disk. So simply select view - show all devices, then select the actual drive you're trying to reformat, then when trying to erase, you should have the option to choose a partition scheme. The next thing you can use Disk Utility’s partition tool for is to erase all of the volumes on a Mac or external disk drive and create new ones. This can be helpful if you wish to change the partition map of a USB, Thunderbolt or other type of storage device from Master Boot Record (for Windows Partitions formatted as MS-DOS FAT or ExFAT) to. In the Disk Utility app on your Mac, select a volume in the sidebar, then click the Partition button. In the pie chart, select the partition you want to delete, then click the Delete button. The partition is removed, reformatted, and all free space is assigned to the previous partition.
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When there are several partitions on your hard drive, and you need one bigger than the other on a particular drive to handle more data in it, you need to know methods to use to resize partitions on Mac. In this article, we'll talk about rules of resizing partition for Mac and how to backup data before resizing partition. Most importantly, you'll learn how to resize partition on Mac with Disk Utility.
In fact, the type of partition map makes almost no difference for non-bootable volumes. Thus, if a Mac owner does not plan to start Mac OS X or another operating system from the external hard drive, he or she can apply any type of the partition map without breaking the head against the wall. Several maps are available (e.g., APT, MBR, etc.). Jan 20, 2018 I have an Apple MacBook Air 13.3in with 128 GB SSD. I have yet to move from Sierra to High Sierra OS, thankfully, as seems to be some problems. I back some stuff to the iCloud but decided to get external hard drive too and was about to plump for a.
- 1. Backup Important Data Before Resizing Partition on Mac
- 2. Resize Partition on Mac with Disk Utility
1Rules of Resizing Partition for Mac
If you want to resize a partition for your Mac without erasing data, there are some rules you need to follow. Ensure you pay attention to these rules for maximum results.
- The last partition on a drive cannot be increased. However, it can be deleted.
- When a particular partition is deleted, the space from it is added to the previous partition.
- Fusion drives can be quickly resized with the version of Mac Utility Disk used for its creation but not with an older one.
- Before you resize a Mac volume, remember to back up the drive because resizing may need you to delete partitions
- Trying to use pie charts to resize a volume is quite difficult to achieve. It is better to use optional sizes rather than using pie chart dividers.
- If you want to increase a particular volume, then the volume next to the affected volume must be deleted to free up more space.
2How to Resize Mac Partition without Losing Data?
To keep your data safe and intact, make sure that you've backed up your data before resizing partition. Here we recommend a backup and recovery service - AnyRecover Data Recovery for Mac, which is a unique software developed by iMyFone team to help Mac users recover data from their disk. With AnyRecover unique algorithm, you can backup your data from a partition on Mac easily.
Key Features- Powerful Partition Recovery: Back up files from partition on Mac and recover all your lost files no matter how they were lost, such as format, resize, accidentally delete, etc.
- Recover All Kind of Files: AnyRecover is a great software you can use to recover any file type. Whether it is documents, photos or videos, AnyRecover is the right tool for the job
- Safe and Reliable: AnyRecover can recover your files safely without overwriting your existing files.
- Supports All Mac OS: AnyRecover supports all Mac OS including macOS Mojave, macOS Catalina, macOS high sierra, and more.
Backup Important Data Before Resizing Partition on Mac
Firstly, download and install the software for Mac, then launch the software on your Mac.
Step One - Select the Path of the File Location
Set the path of data location where you want to get your lost files. Click the 'Start' button to begin the process.
Step Two - Scan the Selected Path
The program will start an All-Round scan on your selected location, once the process is done, all your lost files will be listed out in respective file types.
Step Three - Preview and Recover Lost Files
Before you recover the files, you'll have to preview them to be sure that you've selected the right files. Then click the 'Recover' button.
Now you're ready, without need for worrying about data loss, continue reading to know how to resize partition on Mac by using the Disk Utility.
Resize Partition on Mac with Disk Utility
Mac Disk Utility is a powerful built-in application in Mac OS that has undergone a series of changes with every major OS update.
Many Mac users have complained that using Mac Disk Utility to resize a Mac Volume is no longer easy. However, being an experienced Mac expert, we feel its interface is user-friendly and easy to use. Apple has come up with a well-arranged Mac Disk Utility interface that will make enlarging/resizing of a Mac Volume to be easy.
Steps to Resize Mac Partition
Step 1. Navigate through your menu and open Mac Disk Utility.
Step 2. When Mac Disk Utility opens, select the drive you want to resize.
Step 3. Then select Partition on the toolbar to resize the Volume of your choice using the Utility tool. A pie chart will open showing free space and space occupied by each Volume.
Step 4. For a volume to be enlarged, another one has to be deleted. So, choose the Volume you want to delete on the pie chart.
Step 5. Delete the Volume of your choice and tap the minus icon below the pie chart. The pie chart will give you a warning message about what you've done.
Step 6. If you're satisfied, tap Apply or tap Cancel to delete another Volume.
Step 7. Automatically, Mac Disk Utility will add up the freed space to the Volume instead of the deleted one. However, if you want to customize the Volume sizes, you can select the Volume, specify its size then hit Revert/Return. You can create a new Volume in the leftover space.
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Step 8. Drag the Pie Chart to adjust the size of each volume. When the Volume is adjusted to the size you desire, click Apply, and that's it.
However, there are times when disk utility can't resize partition. Don't worry, there are also solutions available. Refer to this page and you'll get it fixed.
Conclusion: Who would have thought that backing up important files from partition or enlarging Mac partition can be done effortlessly? Well, with AnyRecover for Mac, you can also recover all your lost files which are formatted with a 98% recovery success rate. So, when next you're having problems recovering a deleted file, simply go for AnyRecover.
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.
![Hard Hard](/uploads/1/2/6/3/126390994/138595012.jpg)
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
- 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.
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Reasons to erase
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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.
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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
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- 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.