Free Merge Unallocated Space to System Partition in Windows 10

Usually, you need to merge unallocated space to system partition on Windows 10 because there is low disk space warning on the system partition. Unallocated space usually refers to the partition that has not been formatted, on which you cannot save any data. In some situations, people like to assign a drive letter to an unallocated space and format it to proper format so that they can create a new partition on their computer. However, in most case, people prefers to making an unallocated space on Windows 10 and adding it to a partition like system partition to resolve low disk space warning.

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Create Unallocated Disk Space in Windows 10

You need to make sure that there are two partitions at least on the same hard disk when you want to create unallocated space on Windows 10. Generally speaking, you have two choices to create an unallocated disk space on Windows 10 operating system, namely deleting a partition or shrinking a partition.

1. Delete partition on Windows 10 to make unallocated space

If there is an empty partition, you can delete this partition on Windows 10 under Disk Management. The deleted partition will show as unallocated volume on your computer. You have to pay attention that all data will be erased immediately when you delete a partition. Therefore, you had better backup all important data if you want to delete a partition that contains many files on Windows 10.

2. Shrink and create unallocated space for Windows 10

Without deleting any partition, you can also make unallocated space by shrinking volume on Windows 10. Usually, you need to select a partition that has enough free space and then you can rely on Widows 10 Disk Management or professional partition software to shrink the partition so as to get some unallocated space. Usually, it does not touch any original data by shrinking a partition, so people tends to make unallocated pace on hard drive Windows 10 by shrinking the partition that has much free space.

Method 1: Free Merge Unallocated Space to Windows 10 System Partition

Unallocated space is always needed when you want to extend a partition on any Windows computer. When you get some unallocated space on Windows 10, you can add it to system partition with Windows 10 built-in Disk Management. Disk Management on Windows 10 works as free partition magic that enables you to resize hard drive without repartitioning, but it has some limitation for Windows 10 add unallocated space to system partition. You need to make sure that the unallocated space is behind the system partition in order to merge unallocated space to drive C in Windows 10 with Disk Management.

Method 2: Add Unallocated Space to System Partition C on Windows 10 for Free

You also have another choice to merge unallocated space to C drive on Windows 10 with Diskpart command. Diskpart is a command interpreter, which allows you to mange hard disk on Windows system such as resizing hard disk, assigning a drive letter to disk partition and deleting partition, etc. You can run Diskpart command by inputting a command prompt. You are allowed to resize hard drive on Windows 10 with Diskpart command, but it has following limitations:

  • You have to make sure that there is contiguous unallocated space behind the partition you want to extend
  • Diskpart command is only available for NTFS partition expand
  • Diskpart command cannot extend system partition even there is contiguous unallocated space

Cannot Extend Partition with Unallocated Space on Windows 10

Windows 10 Disk Management and Diskpart command are two kinds of most common solutions for merging combine unallocated space to disk partition on Windows 10. However, in most case, you may fail to extend C drive with unallocated space with those two methods due to their limitations. Usually, you may run into following situations when you cannot merge unallocated space to system partition on Windows 10:

1. You may find that the unallocated partition is unusable when you right click the system partition because Windows 10 Disk Management is grayed out.

2. You may receive message saying that the volume you have selected may not be extended when you run Diskpart command to merge unallocated partition to system partition on Windows 10.

Method 3: Freeware Combine Unallocated Space to Windows 10 C Drive

There is no doubt that Windows 10 partition software is the best choice if you need an easy and free solution for adding unallocated space to Windows 10 C drive. IM-Magic Partition Resizer Free is a freeware that enables you to resize hard drive on Windows 10 without any limitation. You can make unallocated space and the combine the unallocated partition to C drive on Windows 10 by using this free partition software.

Please pay attention:

You can only get unallocated space from the same hard disk no matter you resize hard disk on Windows 10 with any of methods above.


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