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.
