Three Effective Ways to Resize GPT Partition in Windows 10

June 20, 2019

In this tutorial, three easy but efficient means to resize GPT partition in Windows 10 are provided. Come and choose the one that best fits your needs.

Need to resize GPT partition in Windows 10

GPT (abbreviated from GUID Partition Table) is a standard for the layout of partition tables of a physical hard drive. It breaks a lot of restrictions on MBR (Master Boot Record) disks such as supporting the partition size larger than 2 TB, allowing up to 128 primary partitions and so on.

Unreasonable partition capacity distribution happens to Windows users at any time when using GPT disks. For example, a partition is about to be filled up while other partitions have too much free space.

Additionally, many users may find that there is only a big partition on the hard drive when they buy a new computer. But in fact, most of users need two or more partitions to save their system, files or applications separately. In these cases, often the best we can do is to resize partition in Windows 10.

How to resize GPT partition in Windows 10?

To resize GPT partition in Windows 10, three methods are described here. They are Disk Management, Diskpart and AOMEI Partition Assistant Standard respectively. Preview them first and then choose the one that works best for you.

Method 1. Use Disk Management to resize GPT partition

To extend a volume

Step 1. Right click Start (on the lower left corner of your computer) and then select Disk Management.

Step 2. Right click the partition with adjacent unallocated space and then select Extend Volume.

Extend Volume

Step 3. Click Next on the Extend Volume Wizard page.

Step 4. Specify the amount that you want to increase the partition by. Then click Next.

Extend Amount

Step 5. Confirm your operations and then click Finish to proceed.

To shrink a volume

Step 1. Right click Start to choose Disk Management.

Step 2. Right click the partition you want to shrink and then select Shrink Volume.

Shrink Volume

Step 3. Enter the amount of space you wish and then click Shrink.

Click Shrink

Tips:

  • The GPT drive you want to extend should be NTFS or FAT 32 and other types of partitions are not supported.

  • Confirm that there is an adjacent unallocated space on the right side of the partition if you want to perform a partition extension. Otherwise, you’ll find the function extend volume greyed out.

  • You may not be able to shrink volume beyond half its size when using Disk Management. This is because unmovable files messing up the free disk space.

Method 2. Use Diskpart to resize GPT partition

To extend a partition

Step 1. Press Windows logo key + R at the same time. Type diskpart in the Run box. Then click OK.

Step 2. Type the commands below into the Command Prompt one at a time and press Enter after each command.

  • list volume

  • select volume n (n represents the number of the volume that you want to extend)

  • extend size=size (size represents the amount of space you want to add to the current partition )

Step 3. You can get this prompt: “Diskpart successfully extended the volume” after extending.

Diskpart Extend

To shrink a partition

Step 1. Press Windows logo key + R to open Run box. Type diskpart and then click OK.

Step 2. Type the commands below one at a time and press Enter after each command.

  • list volume

  • select volume n

  • shrink desired=desiredsize or shrink minimum=minimumsize (Shrink the selected volume to desiredsize if possible, or to minimumsize if desiredsize is too large)

Step 3. You can get this prompt: “Diskpart successfully shrunk the volume by” after shrinking.

Diskpart Shrink

Tips:

  • All sizes are in megabytes (MB).

  • To extend partition, make sure there is an unallocated space on the same disk.

As you can see from the above, both methods have some limitations. Disk Management only supports NTFS or FAT 32 partitions with adjacent unallocated space when extending a partition. At times, you can’t even shrink the volume larger than its half size.

Care must be taken when using Diskpart as data loss might occur if you make a mistake in the process. All operations steps take place immediately so that you cannot step back. Thus, you’d better do a partition backup in advance. In addition, you may sometimes fail to extend or shrink a partiton and get the error message "Diskpart: there is not enough usable free space". For your data security, the third method is highly recommended.

Method 3. Use the freeware to resize GPT partition

To resize GPT partition in Windows easily and safely, AOMEI Partition Assistant Standard can be your professional assistant. It accepts exFAT, NTFS, FAT32 or Ext 2/3/4 in Windows 10/8.1/8/7/Vista/XP. Compared to Disk Management, this utility enables you to extend partition without worrying if there is an unallocated space next to the partition you want to extend.

With this partition resize tool, you can go back to the previous step easily if you are not satisfied with the current operations. Besides, other powerful features can help you manage your partitions completely including create partition, merge partition, and format partition, etc. Above all, it is free to download and use! Now is the time to resize GPT partition in Windows 10.

Step 1. Install and launch this freeware. Right click the partition you want to resize. Then choose Resize Partition.

Resize Partition

Step 2. Right moves the slider bar or enters the specific amount to extend the partition. Then click OK.

Drag To Extend D Drive

Tips: To shrink the partition, you can left drag the bar or type a specific amount in any boxes.

Step 3. Click Apply to perform all the operations.

Apply

Tips:

  • Confirm that there is an unallocated space on the same disk if you want to extend a partition. If not, you can shrink partitions to get it at first.

  • If the unallocated space is not adjacent to the partition you want to extend, you can move partition to the right position at first.

  • When you shrink the system partition, the operation will under PreOS Mode and your computer will reboot.

  • Above steps also apply to resize GPT partition in Windows 8.

Verdict

This tutorial contains three practical methods to resize GPT partition in Windows 10. In fact, tasks get simpler and safer when you turn to AOMEI Partition Assistant Standard. By the way, this freeware serves you well when you need to resize NTFS partition in Windows.

After doing an edition upgrade you can enjoy more advanced feature, for instance, allocate free space from one partition to extend system drive. But if you are a Windows Server user, AOMEI Partition Assistant Server can be your best choice.