Expand System Partition with Unallocated Space on Windows 10

Face low disk space problem on Windows 10 system partition so you want to extend the partition with existing unallocated space? Is it always possible to add existing unallocated space to expand system partition in Windows 10? What if there is no existing unallocated space on the same hard disk on your computer? Probably, you still have many doubts when you attempt to increase the size of system partition on Windows 10. This page will share tips you need to pay attention to and step-by-step guide to extend system partition C drive with unallocated space on Windows 10.

How to Add Unallocated Space to Windows 10 System Partition?

Usually, unallocated space is not showing up in My Computer, but you can see it under Disk Management. Therefore, you can open Windows 10 Disk Management to see if there is existing unallocated space there. As long as the unallocated space shows contiguous and on the right of system partition, you can follow the steps below to add the unallocated space to system partition:
Step1. Right click system partition (C drive) and select Extend Volume option.
Step2. Enter the amount of space you want to add to system partition.
Step3. Follow the Extend Volume Wizard to add the unallocated space to system partition successfully.
It is often very easy to add the unallocated space to C drive with Windows 10 Disk Management as long as the unallocated volume is showing right behind the C partition.

Why Failed to Extend C Drive with Unallocated Space on Windows 10?

As mentioned above, you can effectively extend system partition with existing contiguous unallocated space on Windows 10. However, have you ever failed to expand system partition with Disk Management in Windows 10? If you meet the similar problem, you may pay attention to following points:
1. The unallocated space is not adjacent to system partition. Usually, there are several partitions on your computer. If there is other partition (s) show between the unallocated space and system partition, you will fail to add the unallocated space to extend system partition on Windows 10.
2. The unallocated space is on the left of C drive, in which situation you will also fail to add it to C partition. Windows 10 cannot extend system partition with unallocated space on its left even if the unallocated volume is contiguous to C drive.

How to Increase System Partition without Unallocated Space in Windows 10?

Another situation you may be not able to increase size of system partition under Windows 10 Disk Management is that there is no existing unallocated space. In this situation, you can get some unallocated space with following two methods:

Method1: You can delete D drive which shows behind C drive under Disk Management. The deleted partition will show as unallocated space behind C drive, so you can add it to increase the size of C drive on your PC.

Method2: You can right click D drive and select Shrink Volume option to squeeze some unallocated space from D partition. This method does not delete any partition or data, but the unallocated space will not show close to C drive.

Expand System Partition with Windows 10 Partition Software

If you meet any problem to expand system partition with unallocated space in Windows 10, you can use Windows 10 partition software to resolve the problem. IM-Magic Partition Resizer Free is a free partition magic tool, with which you can squeeze unallocated space from other partition and add unallocated space to any partition without needing to delete any partition. Therefore, you can use this partition magic to expand system partition whether there is existing unallocated space or not.

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