Fix “Windows Can Only Be Installed on GPT Disks”

When setting up Windows, encountering the error message 'Windows can only be installed on GPT disks' can be frustrating, especially if you're unaware of the underlying cause. This issue arises because Windows in UEFI mode requires a GPT (GUID Partition Table) formatted disk, while legacy BIOS mode uses MBR (Master Boot Record). During installation, if the disk is still set as MBR, Windows won’t proceed. From my experience, the manual Diskpart method is straightforward but comes with a big caveat—it wipes all data on the drive. You access the Command Prompt using Shift + F10 during the Windows setup, type in the necessary commands like 'clean' and 'convert gpt', and then exit. This is effective for fresh installations where data preservation isn’t a priority. However, for anyone wanting to keep their data or avoid command-line risks, using a tool like AOMEI Cloner is a game-changer. It allows you to clone your existing MBR system to a GPT disk safely. The software even auto-adjusts partitions and ensures the cloned system supports UEFI booting, which is essential for a smooth experience. I found this method especially helpful when upgrading from an older HDD to a larger SSD (over 2TB), as the GPT partitioning scheme supports bigger disks and better data reliability. AOMEI’s cloning tool provides an 'Edit Partitions' feature where you can select to convert the target disk from MBR to GPT during cloning—no data loss involved. It’s perfect for users who want to avoid reinstalling Windows from scratch. Plus, if you decide to try it, certain promotional codes can provide significant discounts. In summary, choosing between the Diskpart manual conversion and AOMEI Cloner depends on your needs: fresh install with no data preservation or safe cloning without data loss. Either way, understanding this UEFI/GPT requirement will save you time and headaches during Windows installation.