win8 If MBR + BIOS 350M system partition boot and put WINRE.wim etc.
If it is GPT + UEFI 300M put WINRE EFI system partition boot partition put
But WIN8.1 I tried both MBR + BIOS or GPT + EFI is 350M / 300m wasted MBR + BIOS only put BCD boot hold WINRE.WIM GPT + EFI is empty how could this child? 

Hi,

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Regards,

Lany Zhang