Whether you’re planning to and preparing to dual-boot with Linux or just want to provide a larger margin of error you may have noticed that the default 105-or-273 MB (100-or-260 MiB) partition for the UEFI System Partition is a tad small.
#HOW TO CHANGE EFI SYSTEM PARTITION WINDOWS#
So, you’ve booted up into Windows Setup from your installation media, and you’ve selected to perform a Custom installation. Unplug disks you don’t intend to use during the installation to avoid data loss. You are responsible for any data loss and to ensure that you’ve adequate backups of your data. You should follow this tutorial during the initial Windows installation process with Windows Setup. Windows won’t let you recreate a UEFI system outside the Windows Setup installation program. You can’t rely on this tutorial to grow the UEFI System Partition (ESP) on an existing installation as any attempt would be blocked by your existing partition boundaries. You may need to delete any existing partitions on the drive before proceeding.
This tutorial assumes you’re working with an empty disk, and that your computer is UEFI compliant. I’ll walk you through the process in this tutorial. You can still create a custom-sized ESP by side-stepping out of Windows Setup and into the Command Line for a minute to partition the disk to your liking. Windows Setup, the Windows installation tool, unfortunately, doesn’t provide any graphical tools for shrinking or expanding a UEFI System Partition (ESP sometimes EFISYS.)