If you want to reinstall a new operating system to the original location, maybe you choose to clean the previous OS. Then, you may use the unallocated space to create a new partition. Or you want to delete one active system partition to free up some disk space. Now you don’t want to use one OS and decide to delete it. You have installed two operating systems on your computer. Generally, you may choose to delete a system partition in two cases: How to Delete Active System Partition in Windows 7/8/10 How to solve this issue? Don’t worry, it is easy and there are some solutions below. Tip: In addition to system partition deletion, Windows cannot format the system partition on this disk in Windows 10/8/7. Besides, partition C is also unable to be deleted because delete is not allowed on the current boot, system, pagefile, crashdump or hibernation volume. You can see the partition on disk 1 is labeled " System, Active, Primary Partition", so it is not allowed to be deleted or formatted in Windows 7/8/10. Therefore, if you want to delete your system partition, Windows Disk Management will fail to do this work. In addition, the partition which holds the boot sector must be set active, otherwise, your computer is unbootable. Please refer to Cannot Delete Volumes in Windows for more information.Īs for the system partition, it must be a primary partition which contains the boot loader that is used to boot your operating system. Tip: In fact, there are many partitions that cannot be deleted in Disk Management, including boot volume, the volume where page file, crash dump files and hibernation files are saved, EFI system partition, OEM partition and recovery partition.