How to Resize or Increase Bootcamp Partition without Deleting Windows?

Effortlessly Resize Your Bootcamp Partition: A Step-by-Step Guide

Running dual operating systems on a Mac, with macOS and Windows, is a powerful way to harness the strengths of both. However, when setting up such a system through Boot Camp Assistant, it’s not uncommon to miscalculate the amount of space you’d need on the Windows partition. Later on, as files accumulate and applications increase, you may find yourself wishing for more space on your Bootcamp partition. Thankfully, there’s no need to hit the panic button or contemplate the tedious task of reinstalling Windows to rectify this. With Apple’s built-in “Disk Utility” application, you can reassign space from macOS to your Windows (Boot Camp) partition without erasing any data. In this risewindows guide, we will delve into the process of safely resizing your Bootcamp partition, ensuring your Windows environment gets the breathing room it needs. So, if you’re grappling with space constraints on your Windows partition, read on to discover a seamless solution that keeps both your operating systems intact.


How to free up space on the Apple Mac partition?

To free up space on the Apple Mac partition, do the following:-

Step 1. First, run the Launcher app on your Mac machine.

Step 2. Type disk utility in the search box.

Step 3. Then, from the available results, click on Disk Utility to launch the same. Select the Partition from the top menu.

Step 4. After that, once Partition is clicked, it will show all partitions and sizes available on your Mac machine.

Step 5. Next, since we want to reduce the size of the Macintosh HD partition, which is currently 84GB, click on the Size text box and write a new size (64GB in my example).

Step 6. Now, once a new size is specified for your Macintosh HD partition, hit Enter from the keyboard or click the Apply button.

Step 7. Then, click on the Partition button on the new window when it opens automatically.

Step 8. After that, click on the Partition button again.

Step 9. Here, click the Continue button.

Step 10. So, you will notice that Mac has started resizing the partition.

Step 11. Now, click on the Done button once resizing is completed (it may take more than 10 minutes, depending upon the data stored on your Mac machine).

Step 12. After that, resizing has been completed, and you see the new size of the Mac partition.

Step 13. Finally, you can find unallocated space by clicking on the Untitled option from the left.

Now, on Macintosh HD, we have made 20GB of free space and want to merge it into Windows 10 partition (Boot Camp).

How to add unallocated space on Bootcamp Partition without deleting Windows?

Follow these steps to add unallocated space on Bootcamp Partition without deleting Windows:-

Step 1. First, boot from m Windows OS partition (To boot in the o Windows partition, restart your Mac and hold alt (option) key from the keyboard till you see the boot OS disk selection). From the right arrow key, select Windows partition and press Enter from the keyboard to boot in Windows.

Step 2. Now, once you have logged into Windows OS, right-click on My Computer / This PC from the Desktop icon and select Manage to open Computer Management.

Step 3. Then, on the Computer Management window, click on Disk Management from the left side options.

Step 4. After that, you can see the free space as a healthy partition.

Step 5. Next, right-click and select the Delete Volume option to free up space again.

Here, you will see Unallocated space.

Step 6. Now, download and install the MiniTool Partition Wizard, free software, once free space is deleted.

Step 7. Then, launch the MiniTool Partition Wizard tool.

Step 8. Here, right-click on the BOOTCAMP partition and select the Extend option.

Step 9. Then, select the Unallocated partition/space.

Step 10. Now, click the OK button.

Step 11. Next, it will show a warning message; click the Yes button to proceed.

Step 12. Then, click on the Apply button.

Step 13. Finally, click on the Restart Now button.

After completing all the steps, Windows OS will restart to increase the size of the BOOTCAMP partition.


Efficiently managing space between macOS and Windows on a dual-boot Mac is imperative for optimal performance on both systems. While initially partitioning might pose some challenges in estimating space requirements, tools like Apple’s Disk Utility and third-party applications such as MiniTool Partition Wizard come to the rescue. With these utilities, users can easily reallocate space, ensuring neither OS feels constrained. By following the steps outlined in this risewindows guide, users can seamlessly expand their Bootcamp partition without the risk of data loss, guaranteeing a smooth and efficient experience on their Windows partition.


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