What’s the reason? To answer this question, we need to know what it saves. 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.
#Mac disk utility partition grayed out need to factory reset mac os x
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 Actually, 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.
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