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repartition hard drive windows 10

This article writes everything you need and you want to know about repartitioning hard drive in Windows 10. For Disk Management (DM) vs MiniTool Partition Wizard, which is better for disk managing? Find the answer in the following content.

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What Does Repartition Hard Drive Windows 10 Do?

Repartition a hard drive in Windows 10 refers to reallocate or reassign hard drive space to hard drive partitions. It will change the hard disk layout with the number of partitions and location of partitions. Repartitioning will also change the specifications of involved partition including partition size, label, drive letter, partition type (primary or logical), file system (NTFS, FAT32, etc.), as well as cluster size, etc.

Why Need to Repartition Hard Drive in Windows 10?

Usually, when you buy a computer either new or old, it will come with hard drive(s) that has already partitioned by its manufacturer or former owner. You may be not satisfied with the disk storage space arrangement and find the arrangement is unreasonable, especially for the second-hand machine. Even for the grand-new computer, after several years of usage, you may be bored with its disk layout. So, you need to repartition the hard drives.

Or, after using the harddrive for years, you may encounter low disk space problems (usually happens to system partition C) which means the target partition is running out of storage space. If there is a partition on the same disk that has enough free space, you may consider allocating its free space to the low disk space partition. Therefore, you need to repartition hard drives Windows 10.

How to Repartition Hard Drive Windows 10 with Disk Management?

When it comes to hard drive management, for most users, they will think about Windows Disk Management. It is the system built-in tool for managing hard disks connected to the operating system (OS) and their partitions.

Windows 10 Disk Management

Right-click on a common partition in the Disk Management. In the drop-down menu, you can see the actions you can carry out with the help of DM, with the highlight ones feasible for the current partition. As you can see in the below screenshot, the features available are:

  • Open – Open the partition and display its contents in Windows Explorer.
  • Explore – Open the partition and display its contents in Windows Explorer.
  • Mark Partition as Active – Set current partition status as active. It is usually for system-related partitions from which you want to boot.
  • Change Drive Letter and Paths – Change the drive letter of the current partition. You can also add a drive letter or path for the current volume, or delete the current partition’s drive letter (will cause its contained programs not running).
  • Format – Format current partition of its volume label, file system, and allocation unit size (block size).
  • Extend Volume – Extend current partition to enlarge its size with unallocated space right next to it.
  • Shrink Volume – Shrink the current partition to decrease its size and spare out some unallocated free space.
  • Add Mirror – Add a mirror to the current partition to provide data redundancy by maintaining multiple copies of a partition’s data on different disks.
  • Delete Volume – Delete current partition and the data on it.
  • Properties – Show the property parameters of the current partition.
  • Help – Search “Windows 10 disk management” in explorer.

Disk Management Partition Features

When we talk about repartition hard drive Windows 10, usually, we refer to extend small partitions like system partition, shrink large data partitions, delete unwanted partition, create a new partition, etc.

Delete Partition with Disk Management

Deleting a partition will also delete all the data stored on it. Before starting, you are recommended to back up important files on target partition and save the copy on another place, better on another hard disk drive, or an external hard drive, USB flash drive, etc.

For deleting an existing partition in Disk Management, you should right-click on the partition you do not need anymore and select Delete Volume. Read the warning and click Yes.

Create Partition Within Disk Management

In DM, you are only able to create partitions from the unallocated space. You can’t create a partition from the free space within an already existing partition. If there isn’t any unallocated space on the hard drive, you can’t create a partition unless you delete one or all existing partitions to make some unallocated space according to the guide in the above.

Suppose there is already some unallocated space, you can create a partition on it. Just follow the guidance below:

1. Right-click on the unallocated space and choose New Simple Volume or other kinds of volumes you like if your condition supports.

Create New Partition

  • New Simple Volume – Create a new partition that only locates on one physical drive.
  • New Spanned Volume – Create a new dynamic volume that locates on at least 2 physical disks. Such kind of volumes has no fault tolerance.
  • New Striped Volume – Create a new dynamic volume that locates on at least 2 physical disks and all physical drives provide the same amount of storage space. Such kind of volumes improve read and write speed, but they don’t have fault tolerance.
  • New Mirrored Volume – Create 2 identical dynamic volumes that locate on 2 physical drives respectively. When you write data into the mirrored volume, it actually writes the same data into the two identical volumes simultaneously. So, the available space of a mirrored volume is actually half of its size. When either of the 2 identical volumes fails, the other one can work normally. So, the mirrored volume is fault-tolerant.
  • New RAID-5 Volume – Create a new dynamic volume based on at least 3 dynamic hard drives. A RAID-5 volume has fault tolerance and fast read & write speed.

2. Read the notification and click Next.

3. Specify volume size and click Next.

Specify Volume Size

4. Assign a drive letter or path.

Assign Drive Letter or Path

5. Format the new partition with its file system, allocation unit size, as well as a volume label.

Format New Partition

6. Read the notification and click Finish. Finally, you can see the new partition in your Disk Management.

New Created Partition

That is all about creating a new partition for repartition hard drive Windows 10.

Shrink Partition by Disk Management

Usually, users need to shrink a large partition with much free space to get some unallocated space. Then, they make use of the unallocated space to create a new partition.

1. Right-click on source partition and select Shrink Volume.

2. In the pop-up window, specify how much space to shrink out.

Note: You can’t shrink a partition beyond the point where any unmovable files are located.

Specify Shrink Space

3. Click Shrink and you can see the result.

Successfully Shrink Volume

Extend Partition Through Disk Management

Just as mentioned in the above, you can only extend a partition with unallocated space right behind it. If there is no such unallocated space, you can create some by deleting the existing partition behind.

How about shrinking one partition for some unallocated space? No, it doesn’t help! The shrinking out space is located right behind its original partition; you cannot use it to extend other partitions instead of the original one (that is meaningless). So, the only way for creating unallocated space for extending one partition is to delete the partition that is right behind.

Tip: You should firstly move the data on the partition that you are going to delete to another place before deletion.

Suppose there is already unallocated space right behind the target partition, just follow the below steps to extend the target volume.

1. Right-click on target partition and choose Extend Volume.

2. Read the notification and click Next.

3. Select from which disk to take free space from, and how much free space you’d like to take.

Select Disks with Available Free Space

4. Read the notification and click Finish. Finally, you can see the target partition is extended.

Extend Partition Successfully

Finally, you have a new look on your target hard drive after repartitioning it. After reading through the above content, you get to know that there are many limits for Disk Management to repartition hard drive. Then, is there another powerful program that can repartition a disk without or with little limitation?

Repartition Hard Drive Windows 10 via MiniTool Partition Wizard

How to repartition a hard drive without Disk Management? Then, you should rely on a powerful and reliable third-party program called MiniTool Partition Wizard. It supports not only Windows 10, but also Windows 8/8.1, Windows 7, Windows Server…

As an alternative to Windows Disk Management, Partition Wizard from MiniTool can do all the operations that DM can and without the limitations mentioned in the above. Moreover, Partition Wizard can recover lost data and partitions on the hard disk, test disk read and write speed under set situations, analyze hard drive space and list folders/files based on their sizes, merge/split partitions, move a partition to new location, partition/disk surface test, and so on.

To use Partition Wizard, you should first of all download and install it on your computer, better not on the hard drive you plan to repartition. If there is only one hard disk in your machine, you can try to install the software on the partition you won’t change; or, you can insert an external USB into the PC and install Partition Wizard on it.

Free Download

Create Partition from Existing Partition

Step 1. Launch MiniTool Partition Wizard. In its main UI, right-click on an existing partition from which you are going to create a new partition and select Split.

Select Split Partition

Step 2. Specify the size of the new partition either by dragging the graphic bar left (shrink) or right (extend), or, by inputting a size number. Or, you can just keep the default space allocation of assigning the same space to both partitions.

Specify New Partition Size

Step 3. Preview the changes in the disk partition layout. If you are satisfied with it, click Apply in the lower left to save the changes. From the Pending Operations list, you can figure out that splitting one partition into two is actually shrinking the original partition and then create one new partition from the shrinking space. 

Preview Changes and Apply Changes

Tip: If you are not satisfied with the changes, you can click Undo in the lower left to cancel all pending operations. Then, just start over again to repartition hard drive Windows 10.

Delete All Partitions at One Time

If the hard drive you want to repartition isn’t the boot drive and you want a complete repartitioning, you can first delete all its existing partitions, and then recreate new partitions. If you are tired of deleting partitions one by one, you are able to delete them all in one time.

Step 1. Right-click target hard drive and choose Delete All Partitions.

Choose Delete All Partitions

Step 2. Read the question and confirm it by clicking Yes.

Step 3. Preview and Click Apply.

Apply Deleting All Partitions

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Extend Partition Without Unallocated Space

Unlike in Disk Management, you don’t have to rely on unallocated space to extend a partition. You are able to enlarge a partition with the free space in an existing partition with the help of Partition Wizard.

Step 1. Click on the partition you want to increase space to make it active. Then, click Extend Partition on the left menu.

Select Extend Partition

Step 2. In the next window, specify from which partition to take free space, and how much space to take.

Specify from Which Partition and How Much Space to Take

Step 3. Preview changes and Apply changes.

Apply Extending Partition

From the Operations Pending list, you can know that to complete extending Partition J from Partition G, the program, first of all, shrinks Partition G (to create some unallocated space right behind G and before Partition I), then moves Partition I to make the unallocated space right before Partition J, finally extends J with the unallocated space.

Free Download

Tip: You can also extend a partition with an existing partition by merging them together. The data on both partitions will also be merged into the new partition.

Comparison and Conclusion

Now, let’s compare the repartition hard drive Windows 10 related functions between Disk Management and MiniTool Partition Wizard in the below table.

Features Delete partitions Create partition Shrink partition Extend partition
Disk Management One by one Only from unallocated space/free space Can shrink out nearly all free space From unallocated space right behind target partition
MiniTool Partition Wizard One by one or in one time From both unallocated space (free space) and existing partitions Can shrink out nearly all free space From unallocated space or from free space in existing partitions

By comparing the repartitioning-related utilities of both DM and Partition Wizard, you can know that the latter is much more powerful than the former. Moreover, there are a lot of other useful features offered by Partition Wizard and most of them are free of charge!

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