Mac os resize partition

Question: Q: How to Resize BootCamp Partition without Deleting it on my Mac computer?

Is there any solution to resize my Mac BootCamp Partitions without deleting it and without facing the data loss problems.

Mac Operating System: macOS High Sierra

MacBook Air (2018 or later)

Posted on Dec 27, 2018 3:12 AM

Yes, it is absolutely possible to resize the bootcamp partition without deleting or removing it from your Mac computer. My answer will be applicable for MacBook Pro, iMac, Mac Mini etc. However, before I start let’s tell you something about it.

In Mac computers, Boot Camp is one of the helpful and dual boot feature which helps the user in creating a separate partition and further helps in running 2 different computer operating system on the same Mac machine. This below solution is mainly used to create Windows partition on a Mac drive, so that you can get the opportunity to run even Windows OS while using Mac for plenty of purposes.

At times, initially created Boot Camp partition needs more space, therefore in order to enlarge the size people often format their boot camp drive and recreate it with more space. This process is actually recommended by Mac as Disk Utility can resize an HFS+ (Mac OS) partitions, but not capable enough to revise the size of NTFS based partitions.

However, it is not always necessary to format the full hard drive for resizing the Mac bootcamp partition. Instead you can choose to take image of your Windows Boot Camp partition and then simply restore it. This will preserve all the settings untouched. Below, you will look at steps to enlarge the size of your Windows Boot Camp partition on a Mac based hard disk drive or volume.

Free Available Solution to Resize BootCamp Partition:-

(1) First of all, you need to take the complete data backup of your Windows partition (use a third party tool for image your backup partition) and save it to the desktop computer for further use.

(2) Now, remove the pre existing or old Windows partition and resize the current Mac hard drive partition easily.

(3) Here, after a successful Mac computer partition, create a new Windows partition in free space and set the format to MS-DOS (FAT).

(4) In this step, you need to resize the Mac-boot camp partition according to your requirement using the help of Mac disk-utility and give a new name to this partition.

(5) Further, restart your Mac computer for a new Windows partition and restore the complete Windows data backup partition image you created over newly created Windows partition. (You can try some 3rd party tool to do this task for you more easily and securely)

(6) Finally, run the Mac OS startup disk and check both the partitions properly.

Alternate Solution to Resize BootCamp Partition without Facing Data Loss Problems:-

Although, the above discussed solution is capable enough to enlarge a Mac user Boot camp space, but still there are chances of complete Boot camp drive data loss in case you are unable to restore the image you created and certain other issues while using your Mac computer. Therefore, it is highly recommended to use some safe and reliable application that directly provides you the option to resize your bootcamp partition without facing any kind of data loss errors. You can either using TechSoftwareLogic this Mac hard drive partition manager software or iPartition tool to Resize your BootCamp partition without facing the important data loss problems keeps your data safe and secure.

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How to resize a Mac HD partition to utilize the available free space

Dec 21, 2016 · 3 min read

Summary: This post explains how users can resize Mac hard drive partitions to utilize the available free space. The post also recommends using third-party tools such as Stellar Partition Manager to ease the Mac partitioning process.

Hard drive partitioning is a tricky business, be it on Windows o r Macs. Although it is quite easy to visualize and understand conceptually, what happens to a hard drive’s storage in reality when we create, delete, or resize partitions is often unknown. Which is why users often make mistakes while managing their hard drive partitions without realizing that such little errors can lead to disasters like partition loss and permanent data inaccessibility. Therefore, before attempting to perform any partition related task, gaining complete knowledge about the procedure, its side-effects, and risks is crucial to avoid unexpected surprises.

This post attempts to simplify one aspect of Macintosh HD partitioning — partition resizing through Disk Utility.

A Sneak Peek into Mac HD Partitioning

Most Mac users who use multiple operating systems on their machines are familiar with hard drive partitioning. Hard drive partitioning involves dividing the storage capacity of a hard drive into smaller logical sections that can be managed independently of the others. Each such logical section works like a separate hard drive and is known as a Partition or Volume on Mac.

Users partition their Mac hard drives to avail two main benefits:

• The data stored on one volume is isolated from the data stored on other volumes and thus partitioning introduces a level of security in data organization.
• It helps utilize a single Mac as multiple computers since each volume can host a separate bootable OS without affecting others.

There are three main operations that users can perform on Mac partitions:

• Creating New Partitions
• Resizing Existing Partitions
• Deleting Partitions to free up space

Any interruptions or errors during any of the above mentioned tasks can lead to partition table damage resulting in missing partitions and, ultimately, loss of data.

How to resize a Mac HD partition safely

Users who run multiple operating systems on their Macs frequently delete partitions hosting the other operating systems once their work is done. When a partition is deleted, the free space left behind can be easily used by the main Mac OS X partition. However, Apple support forums are often abuzz with queries by users who’re experiencing trouble or errors while trying to resize their main OS X partition.

Here are a few simple ways in which Mac partitions can be resized safely and accurately:

• Turn on Disk Utility Debug Mode

One of the reasons the main Mac HD partition cannot be resized is because the free space is locked and grayed out in Disk Utility. This is because Disk Utility hides inactive partitions. To access the entire storage of the hard drive, use Disk Utility in Debug Mode to show all partitions (including all free space). For this:

1. Open Terminal
2. Run the command defaults write com.apple.DiskUtility DUDebugMenuEnabled 1
3. Once you can see all partitions on the HD, delete the partitions you need to (if any)
4. Thereafter, you should be able to resize the Mac HD partition through a simple drag-and-drop

Ensure you have a backup of all files on your Mac HD partition before you start resizing it.

• Reboot in Recovery Mode

Take a backup of all files on the Mac HD partition and then follow the below steps:

1. Power on Mac and hold down Command + R to boot in Recovery Mode
2. Open Terminal and run the command diskutil cs list
3. Take the Logical Volume ID (a long string of letters and numbers 10 lines up from the bottom of that command’s output, and use it in the command: diskutil cs revert [Logical Volume ID]
4. This should convert the CoreStorage Logical Volume to a normal disk partition
5. Run diskutil cs list again, and you should receive a “ No CoreStorage logical volume groups found” message.

Now you should be able to resize your partition normally through Disk Utility.

• Use third-party Partition Manager Tools

If you’re unable to resize Mac HD partition using Disk Utility, try using a trustworthy third-party partition manager tool like Stellar Partition Manager . This fully automated software lets you efficiently create, delete, resize, format, hide or unhide Mac partitions including the Boot volume without causing any data loss. The product comes with an interactive GUI which makes working with it very simple.

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How to Resize/Enlarge Partition on macOS Monterey, Big Sur/Catalina, EI Capitan, High Sierra, & Earlier

Last Updated on Aug 13, 2021

Resize/Merge or Delete Partition on Mac using the Free Best Partition Manager, That’s called apple’s Disk Utility app. Prior Mac User worries about expanding/ enlarge partition on Mac, But Smart Apple giving very secure option on the official way, using this way you can increase space in drive partition. Or most of the users trying to install windows on another partition at that time you need enough space there for installation through the boot camp.

we are happy to help you, submit this Form, if your solution is not covered in this article.

Here’ is the one limitation before Enlarge partition on Mac running on the latest macOS, You must have to delete/ Format partition coming after you have to select for enlarging. So keep your partition data backup on other external drives for later use.

Delete Partition on Mac and Merge Partitions on Mac

Are you looking to manage partition on Mac without Extra investment with Purchase for Third-Party software or Expert? Here’s the step-by-step guide on how to Delete Partition on Mac and Merger Partition with it that means you will get a new Resize Partition itself. Using the same method we can add or Create a new Partition Using the Disk utility. Follow the below steps,

1. Open Disk Utility on your Mac from Launchpad or Using Spotlight Search.
2. Clean on the Partition to analyze how we can free up space or Resize the Existing partition by delete some partitions.
3. To delete Partition, select that Partition and CLick on the [-] button, or to Add New Partition Click on [+] size, Resize the Partition using Mouse or Enter exact Number in Size. here I am deleting the partition to resize the primary partition on Mac.
4. Click on the Partition Option from the popup. Make sure “Partitioning this device will permanently erase the data stored on some of the partitions. You can’t undo this action.”
5. Now Every time, Resizing the startup volume will cause this computer to stop responding. So, do this in Break or in your free time.
6. Now, I Resize Mac Partition by deleting the old one. That’s an automatic and Easy Process.

partition-is-resized-on-mac

Step to Enlarge Partition on Mac OS X: MacBook Pro, MacBook Air, and iMac

From this step, you can also decrease, not only increase Mac partition from your drive throughout a very secure way, without losing your data.

Step 1: Launch Utilities app under the /Applications/Utilities/Folder option. or Use Spotlight Search and Find “Disk Utility“

Step 2: Go to the “Partition” tab from the top tabs under the Disk Utilities management windows shown above.

Step 3: View Volume and Select Disk From Left side of window > Now, Tap on Partition from the top tab.

Step 4: Enter New Partition size in GBs.

Step 3: From there you have to drag through mouseClick and move it up and down.

By dragging the downside, your disk space utilizes automatically the selected partition from your Mac.

Verify you have added efficient space on the existing partition and Click on “Apply” to save it.

Now you are done, But to creating another partition or Drive you can do it from the same window, So continue with the next step.

If you wish to delete the partition that chooses it and tap on the delete (-) sign. And otherwise, add a new partition then tap on (+) sign.

And assign a valid name for that partition, Size, and type of format.

Step 4: Next, click on the Apply button.

Step 5: Now give time to process and make partition through disk utility.

For your kind information, you can also install windows on another partition and set it at a primary OS through Boot camp, without spent money on third-party software tools.

Having any trouble guide for Enlarge partition on Mac running on Lion, Leopard? Share with us; we will be glad to assist you in expanding more space in a single partition without effect on data securely.

jaysukh patel

Jaysukh Patel is the founder of howtoisolve. Also self Professional Developer, Techno lover mainly for iPhone, iPad, iPod Touch and iOS, Jaysukh is one of responsible person in his family. Contact On: [email protected] [OR] [email protected]

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Resize Partitions in Mac OS X with Disk Utility

You can easily resize any disk partition in Mac OS X using the included Disk Utility app, located in /Applications/Utilities, and you can even resize a mounted volume. In fact, you can grow or shrink HFS+ (Mac OS X) Partitions on the fly, with the resizing done live regardless of whether the drive is internal or an external drive, or even the boot volume.

A word of advice: Resizing mounted boot volumes isn’t always the best idea in the world because there’s a tiny potential something could go wrong. Before you go messing around and resizing your partitions, be sure to backup your data using Time Machine or whatever other backup service you prefer and make a recent back up.

Resizing a Mac Drive Partition with Disk Utility

It is recommended to back up the drive before modifying the partition table, do that before beginning. When ready, here is how to resize a partition from OS X:

1. Open Disk Utility, found in the /Applications/Utilities/ folder, and select the hard drive with the partitions you wish to resize
2. Select the “Partition” tab and then click the partition to resize, then click and hold on the little dragging widget in the corner as shown in the image below

Size the partition as you wish, then click “Apply” for the changes to take effect

This has been possible from Mac OS X Leopard onward (and obviously Snow Leopard, Lion, and Mountain Lion). As mentioned earlier, it’s always a good idea to back up important data before making adjustments to partition schemes, Time Machine is by far the most efficient way to do so.

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26 Comments

I bought a Lacie Thunderbolt Big 3TB x2. It has two 3tb drives in it. Can I merge them together as one 6 TB disk? I have been looking through Disk utility but havn’t come up with anything.
Thank You Jeff Aspnes

Thanks for sharing the solutions, I have tried to resizing the partition but its now being it has stucked on some verifying hirarchy while resizing and get error.
Please help

Thanks for the guide, very useful 🙂

This really helped. Thanks and God bless.

Thanks for this tip.. I had to enable journaling for the triangle to appear.. (obviously) remove any excess partitions so there is unallocated drive space free to drag to.

I am installing a new 240GB SSD as my system drive in an iMac 27″ (mid 2011); I had been using a 1TB internal drive (with a 1TB partition) only for the system and data drive. I had planned on just cleaning up my 1TB drive and get it down to just the system file / OS and under 240GB. I was able to get it down to about 100GB and that by moving all my data off to an external drive – no sweat there. The drive has been in use for SOME time now with no specific defragmenting or anything on my part. If anything runs on the backend behind the scenes I don’t about it…. So with all this in place I installed the new SSD and a new internal 4TB drive (to be used for data only) and connected my old 1TB to an external USB drive caddy and fired it all up. I followed several success stories for the setup and everything connected and booted up fine. I went into the Disk Utility and began the partition resize of my 1TB to get it down to the 200GB mark (to leave some headroom for the unknown). I hit apply and away she went. I am now on hour 92 of shrinking the partition. The external drive caddy light still shows activity as it has all along (same on/off patterned). I have had many other things to do so letting it run has not been an issue… but, I am ready to get on with this and put it back in use. I am concerned of stopping it but, does anyone know if it should be taking this long or do you thing something is pooched. If I stop it what is the real risk and likelihood of causing more harm or losing the disk data entirely.

Thoughts/Suggestions are welcomed!

hi Steve, I’m having the same issue… did you eventually stop the drive shrinking or let it finish? I’m shrinking my 2TB down to 1TB and I don’t have 90+ hours to wait. Thanks!

Has anyone run into issues with the new 3T drives? I followed all of these steps recently in order to split my drive up to where BootCamp could work with it (needs to be 2.2 TB or less). First of all, I started off trying to split the 3T into two 1.5 partitions. That should have left enough for Bootcamp to use disk0s4. Instead, Disk Utility gave me one 800G and one 2.2T partitions! AND, there was no option to resize. So, I followed Apple’s How to’s to resize the first partition (necessary, because 800G left me with only 90G free space!), which was to remove the second partition. I did, and now I can neither resize the old partition or add the second one back.

The issues arises when we decrease one partition and try to merge that free space into another one. It can’t be done with disk utility. I did the job with Stellar Partition manager, without any extra effort.

Huh? I have done this more than one on more than one Mac, so I strongly disagree. I’m pretty sure this is the topic of this article.

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