By AOMEI / Last Updated July 22, 2019

Generally speaking, one MBR disk on a computer consists of four primary partitions or three primary partition and one extended partition among which extended partition contains many logical drives. Commonly, one hard disk is composed of four primary partitions to be activated as boot partition. As we all know that Windows operating system is saved in primary partition as boot partition. If not, the Windows system will fail to boot.

Once the partition is setting up, it is difficult to resize the system primary partition, due to the Windows is not allowed to operate the booting partition. Even by using the built in Disk Management, it is also quite hard and you need to reinstall operating system. To ensure the performance of Windows operating system as well as resize system primary partition, it needs the help of third-party software,AOMEI Partition Assistant enables to resize partition without data loss and system reinstall.

  • Low disk space to decrease the computer operation speed because of the excessive installing of applications and software.

  • Some particular software requires to install on system partition which partition space is small

  • One oversize partition is allocated at first, now need to resize partition to make the best use of disk space

How to resize system primary partition without reinstalling Windows operation system? Here is the step by step tutorial for this operation.Download it to have a try.


AOMEI Partition Assistant Pro Edition is an ALL-IN-ONE partition solution and disk management tool for Windows 8/8.1/7/Vista/XP/2000 (all editions, support 32-bit and 64-bit). It allows you to resize/move partition, merge partitions, align partitions, split partition, migrate OS to SSD/HDD, convert dynamic disk back to basic disk, and so on. The most popular hard disk management functions are brought together with enhanced data protection including: Partition Manager Features, Disk Management Features, Easy Wizards.

Related articles of resizing system partition:

For Windows Server users, "How to Extend System Partition for Windows Server 2016?" is helpful.

For NTFS file system users, "Extend System Partition without Restarting Computer" may provide assist.