By Ailsa / Last Updated December 2, 2020

What is Boot Camp Assistant and Bootcamp Partition?

Bootcamp partition is a NTFS partition for installing Microsoft Windows operating system on an Intel-based Macintosh computer. Why you want to install and run Windows on a Mac computer? If you want to install some applications that only work on Windows or just want to make it different from OS X something like that, it’s a good choice for you.

Why you need to create a new partition on your Mac? That’s because the Windows and the Mac works on different format. Mac runs on Mac OS X, and Windows runs on NTFS.

Speaking of Bootcamp partition, you have to know the Boot Camp Assistant. The Apple’s Boot Camp Assistant provides you with 3 functions to run Windows on Mac, including help you to partition your Mac hard drive into 2 partitions (the Mac hard drive must be formatted as Mac OS Extended), install Windows device drivers for Apple hardware and allow you to select which operating system to boot.

Why Need to Resize your Bootcamp Partition?

After you create a NTFS Bootcamp partition using Boot Camp Assistant, you can install Windows on this Bootcamp partition. You may underestimate the size of the Bootcamp partition when you creating the partition for Windows. Thus, with your daily use, the Bootcamp partition might run out of the free space quickly Then, it is necessary to increase the Bootcamp partition to make it bigger.

For this, you can delete the current Bootcamp partition and create a new bigger one again, but that will delete all data and you have to reinstall Windows operating system and other programs from scratch. So, many users are looking for a way to resize Boot Camp partition without reinstalling Windows or losing data. In this article, we will walk you through the details about resizing NTFS Bootcamp partition.

Best way to resize Bootcamp partition without reinstalling Windows

Typically, you may turn to the Disk Utility for help to resize Mac partition, you can locate its location /Applications/Utilities. However, Disk Utility can’t expand or shrink the Bootcamp partition due to it’s a NTFS file system partition. So, it’s not an easy job to resize Bootcamp partition.

If you ask Apple for help, the solution could be backup your data on the Bootcamp partition, remove it, then create a new Bootcamp partition with the size you want and reinstall Windows. As we mentioned before, it’s not the ideal solution for vast majority of users.

Thus, you can turn to the free partition manager: AOMEI Partition Assistant Standard. It is a free yet professional software to resize the Bootcamp partition without losing data or deleting Windows. The instructions listed below as you can see. To resize BootCamp partition in Windows 10/8/7, there are two ways: increase Bootcamp partition size, and decrease Bootcamp partition size. Here, we mainly show how to increase Bootcamp partition size.

Steps to resize Bootcamp partition

Before you do:
1. Backup your valuable files or documents in case of data loss cause by incorrect human operation.
2. Please release some unallocated space for Bootcamp partition from other Mac partitions with Mac Disk Utility, which is necessary for resizing the Bootcamp partition.
3. Set the Bootcamp as the boot disk, restart the Mac computer into Windows environement.

Step 1. Free download AOMEI Partition Assistant Standard, install it on your Windows, and launch it to enter its main interface.

Step 2. Right click the Bootcamp partition and choose Resize/Move Partition. Or click Bootcamp partition and select Resize Partition at the left column.

Resize Bootcamp Partition

Step 3. Drag the double-arrow rightward to increase Bootcamp partition size with an unallocated space as you want. Click OK to go on.

Enlarge Bootcamp Partition

Tip: Drag the double-arrow leftward will shrink the Bootcamp partition if you would like to.

Step 4. Press Apply to expand the Bootcamp partition.


At this moment, with the help of AOMEI Partition Assistant Standard, you can resize Bootcamp partition without reinstalling Windows or losing data in Windows 7/8/10. In addition, if you upgrade to Professional edition, you can enjoy more advanced functions like: split Windows partition, extend system partition, allocate free space from one to the other, migrate OS to SSD between MBR and GPT, convert primary partition to logical without losing data, and more.