How to Add Unallocated Space to D Drive on Windows 10/8/7

Gemma posted on Sep 07, 2020 to Partition Master | How-to Articles

What is Unallocated Space?
How to Add Unallocated Space to D Drive (3 Ways)
Bonus Tip: Create New Partition with Unallocated Space

What is Unallocated Space?

The computer allocates space on the hard drive as adjacent groups of sectors or clusters. When you create a new file, the operating system finds available space and allocates that space to the file. The unallocated space, also referred to as "free space", is the area on a hard drive where it is not allocated to active files within a file system. In other words, only if the unallocated space is allocated to any drive on your computer it can be used to store data and files.

Generally, the unallocated space is invisible on your computer. You can check the unallocated space in the Disk Management on Windows 10/8/7 computers. In this article, we will introduce how to add unallocated space to D drive. Indeed, if you want to add unallocated space to other drives, this page is also helpful.

Check Unallocated Space

How to Add Unallocated Space to D Drive

On Windows 10/8/7 computers, users have three options to use the unallocated space to expand the D drive: professional partition manager, disk management, and DiskPart CMD command. But these three methods require users to have different levels of partition knowledge. Let's check these methods one by one.

1. EaseUS Partition Master - Easiest

This method is the easiest one. You don't need to have much partition knowledge. All you need is a professional partition management tool, and this tool will help you with all operations. Here we recommend EaseUS Partition Master. It is specialized in computer partition management. Here are the features of EaseUS Partition Master.

  • Supports users to resize, move, create, format, and delete partitions.
  • Supports users to convert from MBR to GPT and vice versa without data loss.
  • Enables users to migrate OS to SSD to speed up Windows.
  • Recover deleted or lost partitions by scanning the whole disk or unallocated space.

Please download the EaseUS Partition Master and follow the guide below to see how to add unallocated space to D drive in 3 steps.

Download Now

 Windows 10 is supported

Step 1. Right-click the target partition that you want to extend with unallocated space, select "Resize/Move".

resize unallocated space

Step 2. Drag one side of the target partition to the right or left so as to add unallocated space into the current partition.

resize unallocated space 2

With the Resize/Move feature, you can directly add unallocated space to any partition without moving its position at all.

Step 3. Click "OK". Click "Execute Operation", and it will execute the operations to add the unallocated space into the target partition eventually.

resize unallocated space 5

2. Disk Management - Medium

You can also try to add unallocated space to a partition with Disk Management on your computer. This method is best for experienced users, so that it might be a little bit difficult. Don't worry, follow the step-by-step guide below, you can also add the unallocated space to the target drive.

Step 1. Right-click "This PC" and choose "Manage". Then click "Disk Management" to open Disk Management.

Step 2. Right-click the partition you want to manage and select "Extend Volume".

Step 3. Click "Next" to continue adjusting the unallocated space's size to add to the selected partition.

Step 4. Continue to click "Next" and "Finish" to finish the process.

3. DiskPart Command Prompt - Difficult

For professional users, they can manage the unallocated space with DiskPart CMD. Here are the detailed steps.

Step 1. Open DiskPart command prompt:

Type CMD in Search > Right-click Command Prompt > Select "Run as Administrator" > Type diskpart and hit Enter.

Step 2. Type the following command links and hit Enter each time:

  • list disk
  • select disk 0 (replace 0 with your disk number)
  • list volume
  • select volume d (replace d with the target partition number that you want to extend)
  • extend size=number (adjust and add unallocated space to the selected volume in MB)

Step 3. Type exit to close DiskPart.

Now you can check if the unallocated space is added to the D drive.

Bonus Tip: Create New Partition with Unallocated Space

Besides adding free space to an existed partition, you can also create a new partition with the unallocated space. EaseUS Partition Master will provide you with a simple and easy method. Keep reading and check how to create a new partition with EaseUS Partition Master.


Step 1: Launch EaseUS Partition Master

On the main window, right-click on the unallocated space on your hard drive or external storage device and select "Create".

Create partition on unallocated space

Step 2: Adjust the new partition size, file system, label, etc.

Set the size, partition label, drive letter, file system, etc. for the new partition and click "OK" to continue.

Set up new partition

Step 3: Confirm to create a new partition

Click on the "Execute Operation" button and confirm to create a new partition by clicking "Apply".

Confirm and keep all changes

The Bottom Line

That's all about how to add unallocated space to D drive. You can choose any of the three methods mentioned above according to your needs. As you can see, EaseUS Partition Master always provides you with a quick and convenient experience in partition management. Besides allocating free space, you can also convert the primary partition to a logical partition, merge two partitions into one, and create a WinPE bootable disk with EaseUS Partition Master. Now download the software and have a try.

Download Now

 Windows 10 is supported

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Frequently Asked Questions

Why Choose EaseUS Partition Master?

"I've used Partition Master Professional many times to create, delete, format, move, rename, and resize partitions."PCWorld

"Partitioning tools have come a very long since the days of complicated command line utilities and EASEUS Partition Master is one of the most advanced programs available."TECH ADVISOR

"I love that the changes you make with EaseUS Partition Master Free aren't immediately applied to the disks. It makes it way easier to play out what will happen after you've made all the changes."Lifewire

Will the "Migrate OS" feature transfer the Windows system files only or the whole C drive?

To ensure that the migrated system will boot normally, the Migrate OS feature will transfer all the files in the system and the boot partitions. Generally, the boot partition is the C drive so the transfer will include all the files in C.

Does EaseUS Partition Master license apply to multiple computers?

The license of Partition Master Professional and Server editions can be used on 1 computer only, while that for for the Technician and Unlimited editions can be used on multiple machines.

What is the difference between EaseUS Partition Master Trial version and the Free version?

Free is for home users only, with most basic functions available such as partition resize and clone. While trial can help you understand how this product works and test what a full license can do on a business or server OS machine.

Will it cause any data loss after resizing the partition in EaseUS Partition Master?

Generally, it will not cause any data loss or boot issue by resizing a partition. However, in order to protect your data, we suggest that you backup the partition before resizing, in case of any unexpected situations such as power outages, computer hardware failures, etc. You can use EaseUS Todo Backup to backup the partition and its trial version is fully functioned for 30 days.

What should I prepare before resizing the partition?

On the partition that is going to be operated, there might be some files being occupied by other programs. To ensure a successful operation, we suggest that you close all the unnecessary software before resizing that partition. Otherwise, EaseUS Partition Master will detect the partition being locked by the other software and require a reboot to resize the partition under boot mode.

About EaseUS Partition Master

All-round disk & partition management software for personal and commercial use. Let it manage your storage drive: resize, format, delete, clone, convert, etc.

Video Tutorial

How to Partititon a Hard Drive on Windows 10/8/7