The EFI System Partition (ESP) is typically used by computers that adhere to the UEFI or Unified Extensible Firmware Interface. This specific partition has been developed to ensure that the UEFI firmware will load the OS and all the rest utilities present in the system as soon as the computer boots up.
The ESP contains four main components:
1. Boot loader programs for the operating system;
2. Device driver files for all the hardware devices present and utilized by the computer during its boot time;
3. System utility programs that start running prior to booting an operating system and;
4. Data files like error logs.
Reading here, you know ESP is vital for a normal boot. In Disk Management utility, you will find this partition has no drive letter. By right-clicking on this drive, you will see nearly all features listed in the context menu are greyed out, including “Delete Volume”. This is because ESP is protected by Windows and any faulty operation can lead to the operating system won’t boot. But if this operating system is no longer needed, how to delete EFI system partition?
Actually, there are two ways to do this job: using diskpart or third-party partition software.
Way 1. Delete EFI Partition with Partition Manager
Using a professional disk partition manager can make it easier. Here you can employ MiniTool Partition Wizard to help you. With the Free edition, you can delete the EFI system partition when it is connected as a secondary hard drive. With the Pro edition, you can delete it on your PC in WinPE directly.