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How to Resize Partition without Losing Data on Windows

How to Resize Partition without Losing Data on Windows

Resizing partitions is a common task for anyone managing computer storage, and it often comes with the worry of losing important data. It’s a job that requires careful planning and reliable tools. In my experience, there are several methods to safely resize a partition without the fear of data loss. In this article, I’ll guide you through various techniques I’ve used effectively, including the use of built-in operating system tools and third-party software solutions.


Common Scenarios:

Outgrowing Your Storage 📈

  • Upgrading to a larger hard drive: You’ve purchased a new, larger hard drive and need to transfer your existing data without loss.
  • Expanding for new applications: Your current partition is filling up and you need to allocate more space for new software or files.
  • Organizing drive spaces: You’re reorganizing your hard drive’s structure for better data management and need to adjust partitions accordingly.

Data Segregation and Protection 🛡

  • Creating separate workspaces: You’ve decided to segregate personal data from work files by resizing and creating new partitions.
  • Enhancing system performance: Allocating a dedicated partition for your operating system can improve overall system performance and stability.
  • Preventing data corruption: By isolating areas of the drive, you aim to protect critical data from potential corruption in other partitions.

System Upgrades and Dual-Booting 🔄

  • Installing a new operating system: You’re planning to install a secondary operating system and need to resize an existing partition to create space for dual-boot setup.
  • System updates requiring more space: Your operating system is due for a major update and needs additional room on its dedicated partition.
  • Repartitioning for system repairs: There’s a need to resize partitions to facilitate system repairs or data recovery processes.

Step-by-Step Guide. Resize Partitions Without Losing Data:

Method 1: Windows Disk Management 🛠

  • Open Disk Management by right-clicking the Start button and selecting ‘Disk Management’ from the menu.
  • Right-click the partition you wish to resize and select ‘Shrink Volume’ to reduce its size, or ‘Extend Volume’ to increase it, if there’s available unallocated space.
  • Follow the on-screen instructions to complete the resizing process.

Note: This method does not require third-party software, but there must be contiguous unallocated space next to the partition you wish to extend.

Conclusion: Windows Disk Management is an easily accessible tool for simple partition resizing tasks, especially when working with unallocated space.

Method 2: macOS Disk Utility 🍏

  • Open Disk Utility by navigating to Applications > Utilities or using Spotlight Search.
  • Select the drive you want to modify and click on ‘Partition’.
  • Adjust the partition size by dragging the handles or entering specific values, then click ‘Apply’ to execute the changes.

Note: Before starting, ensure that Time Machine backups and FileVault are disabled to avoid complications.

Conclusion: Disk Utility provides a graphical interface that makes it easy for macOS users to resize partitions without data loss.

Method 3: GParted Live 💽

  • Download the GParted Live ISO from the official website and create a bootable USB drive or CD.
  • Boot your computer from the GParted Live media.
  • Select the partition you wish to resize in GParted’s interface, right-click it, and choose ‘Resize/Move’.
  • Adjust the size settings and click on ‘Apply’ to begin the resizing process.

Note: GParted Live is a powerful tool that can handle a wide variety of file systems, but always back up your data before using it.

Conclusion: GParted Live is an excellent option for users who need a free, open-source solution for resizing partitions on almost any operating system.

Method 4: EaseUS Partition Master Free 🌟

  • Download and install EaseUS Partition Master Free from their official website.
  • Launch the program and right-click on the partition you wish to resize, then select ‘Resize/Move partition’.
  • Drag the partition borders or type in the desired partition size to adjust it.
  • Click ‘OK’ and then ‘Execute Operation’ to apply the changes.

Note: This software offers a user-friendly interface, making the process straightforward for users of all skill levels.

Conclusion: EaseUS Partition Master Free is a great tool for those looking for more functionality than the built-in Windows Disk Management provides.

Method 5: AOMEI Partition Assistant Standard 🛡

  • Download AOMEI Partition Assistant Standard from the offical website.
  • Install and open the software, then right-click on the partition to be resized and choose ‘Resize Partition’.
  • Drag the slider to adjust the partition size or input the values manually, and click ‘OK’.
  • Click on ‘Apply’ in the toolbar to execute the operation.

Note: This tool also allows you to merge, split, and create partitions with ease.

Conclusion: AOMEI Partition Assistant Standard is a versatile and user-friendly option, suitable for both beginners and professionals looking to manage their partitions.


Precautions and Tips:

Safe Resizing Practices 👍

  • Always backup your data before attempting to resize partitions, even if the process is non-destructive.
  • Ensure your computer is connected to a reliable power source to avoid power outages during the resizing operation.
  • Close all running programs and disable antivirus software temporarily to prevent interference with the partitioning process.

Choosing The Right Tool 🧰

  • Select a partitioning tool that supports the file system you are working with (e.g., NTFS, FAT32, HFS+, etc.).
  • Read reviews and choose trusted and well-reviewed tools to minimize the risk of software-related issues.
  • Consider using live boot tools like GParted when resizing system partitions to prevent them from being in use during the operation.

Best Practices for Partition Management

Partition management is a critical aspect of maintaining a healthy and organized disk space. One of the best practices in partition management is to plan your partitions carefully. Planning ahead for the amount of space needed for each type of file can save a lot of headache later. It’s also wise to keep partitions as defragmented as possible for optimal performance.

Understanding the limits of partition resizing is another important factor. Some operating systems or hardware configurations have limits on how much a partition can be resized. Researching these limitations in advance can prepare you for a smooth process.

Furthermore, it’s essential to monitor disk health using tools like CrystalDiskInfo to ensure there are no underlying issues that may affect partitioning tasks. Keeping the disk’s firmware updated and ensuring the proper drivers are installed can also prevent problems.

Lastly, consider defragmenting the drive (for HDDs) before resizing partitions. This process can consolidate free space, making resizing smoother. Defraggler is a popular tool for this purpose, though SSDs should not be defragmented due to the nature of flash memory.


In conclusion, resizing partitions without losing data is entirely possible with the right knowledge and tools. From my personal experience, the various methods and tools mentioned in this guide are reliable and cater to different needs, from casual users to IT professionals. Regardless of the approach, remember the importance of backing up your data and following the best practices for partition management to preserve the integrity of your data.

For more advanced tasks, don’t hesitate to consult more detailed documentation or seek professional assistance. Keeping your partitions adequately managed ensures a well-organized and efficient storage environment, so take the time to apply these methods and safeguards to your partitioning tasks.


On Windows, you can use the built-in Disk Management tool to resize a partition by right-clicking on the desired partition and selecting 'Extend Volume' or 'Shrink Volume'. Ensure you have backup before starting.

Yes, macOS users can utilize Disk Utility to adjust partition sizes without losing data. Choose the partition, click on 'Partition' button, and adjust the size slider carefully.

Always back up your data to another drive or cloud storage. Ensure your system is connected to a power source and avoid interrupting the resize process once it begins.

Resizing a partition alone should not impact system performance, provided there's enough free space for the operating system to function efficiently.

Linux users can safely resize partitions using GParted, a free and open-source partition editor. Be sure to unmount the partition and backup data beforehand. Visit GParted for more information.

MiniTool Partition Wizard is a popular option that supports multiple operating systems for partition resizing. Always verify compatibility with your OS version. Check out MiniTool for their tool.

While generally safe, there's a small risk of data corruption if the process is interrupted or if there are existing disk errors. Always perform a disk check and backup your data first.

External hard drives can also be resized just like internal ones. The process and precautions to take are the same, including using tools like Disk Management or GParted.

The duration depends on the size of the partition and the amount of data. Typically, it can take anywhere from a few minutes to several hours.

Defragmenting is not strictly necessary, but it can help consolidate data and potentially reduce the resizing time for certain systems, especially if the drive is heavily fragmented.