Windows and linux boot in two stages:
1. Use BIOS (or UEFI) to boot from media
2. Load own OS drivers and access media direct

Consider Windows ISO. grub4dos can map ISO as a CD and we can start Phase 1 because it uses BIOS calls to access media and load OS drivers. Now in Phase 2, Windows uses Windows drivers. All grub4dos BIOS mapping is lost - Windows drivers do not use BIOS, they access the media direct but all they find is .ISO file, not \sources\install.wim, etc. because it is inside the ISO. Also, if E2B is a Removable USB drive, Windows can only access 1st partition.
SteveSi 05/03/2016

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