How to resize or increase Bootcamp Partition without deleting Windows?

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You can install Windows 10 / 8.1 / 7 on a Mac machine with the help of an official Boot Camp Assistant provided by Apple itself. If you have initially specified some storage and installed Windows OS on Apple Mac, later you want to resize the partition of Windows, you need to delete the Windows Partition through Boot Camp, and again you have to install Windows. It is challenging for those who have some important data on Windows partition and can’t be moved on an external drive as they don’t have it. There is a way to resize the partition of Windows (Boot Camp) without erasing the Windows operating system.

How to resize or increase Bootcamp ...
How to resize or increase Bootcamp Partition without deleting Windows?
To do the same, you have to free up space first on the Mac OS, and then you can add that much free space on the Windows partition (BOOTCAMP).

How to free up space on the Apple Mac partition?

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

Step 1. Run the Launcher app on a Mac machine.

Step 2. On the search box, type disk utility.

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

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

Step 5. 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. Once a new size is specified for your Macintosh HD partition, hit Enter from the keyboard, or click the Apply button.

Step 7. Click on the Partition button on the new window when it opens automatically.

Step 8. Click on the Partition button again.

Step 9. Click the Continue button.

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

Step 11. 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. Now resizing has been completed, and you see the new size of the Mac partition.

Step 13. You can also find unallocated space by clicking on the Untitled option from the left side.

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

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

Step 1. Boot from Windows OS partition (To boot into 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. 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. On the Computer Management window, click on Disk Management from the left side options.

Step 4. You can see the free space as a healthy partition.

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

Now you will see Unallocated space.

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

Step 7. Launch the MiniTool Partition Wizard tool.

Step 8. Right-click on the BOOTCAMP partition and select the Extend option.

Step 9. Select the Unallocated partition/space.

Step 10. Click the OK button.

Step 11. It will show a warning message; click the Yes button to proceed.

Step 12. Click on the Apply button.

Step 14. Click on the Restart Now button.

Now, Windows OS will restart to increase the size of the BOOTCAMP partition.


  1. hi, great post and topic! however, my situation is different and i’m afraid to try things willy nilly…

    i have a macbook pro 2012 i think and it was almost impossible to get windows on it, the normal bootcamp way didn’t work, i had to really massage it on. i finally did and both the mac and windows sides work fine. however, it turns out i allocated too much disk space to the windows side! so now what i want to do is shrink the windows allocation and increase the mac OS. i want to just move some of the free space back to mac, but i don’t want any new partitions.

    is this possible? how can i do it?


  2. I did this and windows is larger and working but when i boot back into Osx the bootcamp partition is no longer shown on desktop just says unmounted in disk utility. Any way to fox this

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