Ok, after re-baking a fresh Win7PE, BCDedit and Bootrec are found

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If booting from USB Win7PE stick, how to show/configure the right partition(s) for bootrec with the hdd installed windows systems?
For example:
Drive K: and M: in WinPE are containing the two installed hdd Win7-systems, another hidden partition (100 Mb boot) is not shown in file manager.
How to transfer bootsector, mbr and so on to this hdd? Thx for help...