Use one of these methods to fix your EFI partition on Windows 10 or 11. How to Fix Missing EFI Partition on Windowsĭon’t worry too much if your EFI partition is lost, as you can easily fix it on your own. Until it is fixed or restored, Windows will refuse to boot. If no EFI system partition was found, it may be because it was accidentally deleted, or it has become corrupted due to a sudden power outage or the appearance of bad sectors. The “Error loading operating system” message will appear when your EFI partition is missing. Instead, the bootloader is located in the first sector of the disk. It is responsible for storing essential files that your UEFI firmware uses to boot your Windows operating system, such as the bootloader.ĭrives that use the Master Boot Record (MBR) partitioning scheme will not have an EFI partition. In fact, it won’t even appear in File Explorer, instead being found in Disk Management. It’s a relatively small (100 MB) FAT32-formatted partition that typically isn’t assigned a drive letter. It’s also commonly referred to as EFI System Partition (ESP). If your drive uses the GUID Partition Table (GPT) partitioning scheme, you will have an Extensible Firmware Interface (EFI) partition. What Causes “Error Loading Operating System” on Windows? What happens if there is no EFI partition?.What is the EFI system partition used for?.How to Recover Lost Data From Hard Drive.Method 2: Manually Recreate EFI Partition Using DiskPart.Method 1: Try Using Automatic Boot Repair.How to Fix Missing EFI Partition on Windows.What Causes “Error Loading Operating System” on Windows?.
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