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  • A screenshot of Windows own Disk Management would probably gives us more info. Anyway, the message is probably sort of bogus. It may probably be just that the tool does not how to handle things when there isn't a dedicated boot partition, which means it can't simply replace it with an EFI system partition (ESP). You may consider shrinking the main partition yourself, then create an ESP with e.g. diskpart and install the UEFI Windows Boot Manager to it with bcdboot. Then convert only the partition table style with some other tool (gdisk on Linux or whatever).
    – Tom Yan
    Commented Dec 22, 2022 at 4:38
  • imgur.com/a/RTCMLGa Here is a picture of it. sorry.
    – Jen
    Commented Dec 22, 2022 at 5:10
  • Hmm okay. Seems that your current Windows Boot Manager is indeed on Disk 1 / one of the HDD. But the suggestion / instruction I've given stands anyway.
    – Tom Yan
    Commented Dec 22, 2022 at 6:01
  • Thank you, I am a not as much of an expert, can i get a bit easier steps on how to do it. Can I use the AOMEI application to help me do it? really appreciate it.
    – Jen
    Commented Dec 22, 2022 at 6:31