You’ll be using a piece of software called Disk Utility. Software that is part of your Mac’s operating. Mac Partition Manager or Mac Hard Disk Manager or Partition Manager Mac Software helps the Mac OS X users to Create, Resize, Format, Delete macOS Hard Drive Partition without any Data Loss Problems. The Software for macOS Hard Disk Drive (HDD) Partition Management is an Award Winning and One of the Top Rated Partition Manager Mac Tool on Major Online Tech Magazines, Forums & Blogs.
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.
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.
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
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.
The Mac Partition Manager Application Software gives users an option to partition the Mac based hard drive with proper data safety. Apple macOS users can roll back to the previous state before taking the final action, after using the Mac partition maangement utility. Some of the key features provided by this Partition Manager App for Mac Software have been discussed below:-
Create New Mac Hard Drive Partition
The Best Mac Partition Manager Software helps the Apple macOS user to create a new partition on the hard drive. Additionally, if there is any free space available on HD, then below mentioned application also shifts pre-exist space onto that drive to make some room available for new Mac-partition. Free Download Mac OS X Partition Manager to Create a new partition on Macintosh computer without any data loss problems.
Delete a PreExisting Mac Partition
If a user wants to delete a Mac-partition to free up some hard drive space, then using the help of Partition Manager Mac; they can delete the pre-existing volume. But, at the same time, it is advisable to backup the complete data, which can be useful when some data loss situation arises. To delete a partition on macOS, a Mac user simply need to create a separate bootable media using the help of Partiiton Manager Software.
Resize BootCamp Partitions and NTFS Drives on Mac
Using the help of Apple Partition Manager Mac, tool a user can also resize the BootCamp partition without any change in the original files. This feature will make sure that appropriate partition size for both Windows as well as Mac operating system should be allowed. Also, a Mac user can connect NTFS formatted external drives & then resize the partition.
Reliable Tool to Resize Mac Hard Drive Partition
The Partition Manager Program for macOS resizes the HD partition and make free-space to be available for the end users. It makes the complete process securely without any loss of data from Mac-drive. It is the #1 Tool to Resize macOS Hard Disk Drive (HDD) or Volume Partition without degrading the data quality.
Provide Format Partition Option for Mac Users
Along with the above-discussed features, the software allows a user to quickly format a specific volume or entire Mac drive. This feature comes handy when one wants to completely erase all the data reside on HD. It will also remove any malicious, virus etc. from Mac hard disk drive (HDD).
Helps in Creating a Bootable Media Drive on Mac
If you want to do partitioning related tasks on Mac boot drive, then Partition Manager for macOS Software helps in creating a separate bootable media. However, before doing this operation on the Mac, try to make sure that you have proper data backup available on the external hard drive.
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‘Hiding’ and ‘Revealing’ Mac Partition
Using the help of 'Hiding' option, you can cover up a specific Mac partition to secure data or make it completely inaccessible for the end user. Also, using the help of ‘Revealing’ feature, you can easily reclaim the hidden partition within minutes after using macOS Partition Manager.
Provides Rollback Feature for all the Mac OS Versions
Hard Disk Partition Mac
‘Rollback’ feature provided by Mac Partition Manager helps in rolling back to a previous state. This feature will prove beneficial when something goes wrong while performing the partitioning operation on Apple Mac hard drive and will brings the macOS machine to a well running & consistent state.