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Commonly we are unable to delete it in Windows ( Delete Volume feature is grayed out): To see it, we have to enter Disk Management or Disk Utility. Why EFI System Volume Cannot be DeletedĬurrently, after we successfully install Windows OS or Mac OS X on a GPT disk of PC, an EFI system partition (ESP for short) may be created, and it isn’t shown in Windows Explorer or Macintosh Explorer. For example, if we are dual booting Windows 7 and Windows 8, with Win7 saved in drive C and Win8 in drive D, we are able to delete volume C but cannot delete D when Windows 8 is running.

If Windows OS saved in volume C is running, we will be not allowed to delete the volume, because deleting it will result in a lot of errors and disorder.Īctually, we had better say the volume storing Windows OS which is loaded cannot be deleted rather than volume C. Generally, the volume saving Windows system files is always allocated with letter C by default when we are installing the first operating system.

Why Some Volumes Cannot Be Deleted in Disk Management Why Volume C Cannot Be Deleted However, when deleting volume C in Disk Management users may encounter the situation where “Delete Volume” feature is grayed out, like these:Īctually, drive C is not the only volume that cannot be deleted in Disk Management, and boot volume, the volume saving page file, crash dump files, or hibernation files, the protected EFI system partition, recovery partitions, OEM partition, and the partition on removable device cannot be deleted in Windows Disk Management, too. Normally, it is very easy to delete volumes: go to Disk Management utility of Windows, then right click the volume we want to delete, and choose “ Delete Volume” feature from the popup menu. In many situations, we may need to delete an existing volume ( it is also called partition in old versions of Windows OS like Windows XP and Server 2003) to free up space or delete all volumes to convert disk from dynamic to basic or from MBR to GPT.