If you accidentally deleted EFI boot partition in Windows 10, Windows will be naturally unbootable due to missing boot files. When a computer is powered on and booted, UEFI firmware loads files stored on the EFI System Partition to start installed operating systems and various utilities. It contains the boot loaders or kernel images for all installed operating systems. When you install Windows on a clean disk that is initialized to GPT, Setup will create an EFI partition (ESP). What Is EFI System Partition (UEFI + GPT) And you may receive error messages like BOOTMGR is missing or Operating System not found. If the active system reserved partition is lost, Windows will be unbootable since no BOOTMGR and BCD are found. This partition holds the Boot Configuration Database (BCD), Boot Manager (BOOTMGR), Windows Recovery Environment and reserves space for the startup files which may be required by BitLocker, among which BCD and BOOTMGR are vital parts to start Windows. When installing Windows 7/8/10 on a clean disk which is initialized to MBR, the setup will create a system reserved partition at the beginning of the hard disk and mark it active. What Is System Reserved Partition ( Legacy BIOS + MBR) Tip: Since there are 2 types of booting mode, namely Legacy BIOS + mbr and UEFI + GPT, we talk about this issue from 2 aspects.
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