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I am currently producing a bootdisk (similar to Medicat) that will boot live/installer linux and windows PE/install. I have managed to get bootmgr to load on the ISO but it says boot/BCD is missing. Is there a way to load BCD from alternate location using isolinux/syslinux?

My entries for Windows are as follows: 

label 11
    menu label Multi Windows 10 Install      ==>
    com32 chain.c32
    append boot ntldr=/WindowsInstall/Windows10/bootmgr

label 12
    menu label Multi ^Windows 10 PE          ==>
    com32 chain.c32
    append boot ntldr=/WindowsPE/Windows10/bootmgr

Each disk for windows is stored under either the WindowsPE or WindowsInstall directories. So the BCD for Windows Installation is stored as /WindowsInstall/Windows10/boot/bcd

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    I don't know about other Windows PE but was facing same issue when using Bob.Omb’s Modified windows PE : Woeusb for Linux solved my problem
    – Madhubala
    Commented Jan 25, 2020 at 4:27

2 Answers 2

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This free tool claims to do EXACTLY what you are asking about. It's a windows program but there is also information on that page on how to pull it off from Linux.

This is old but also does exactly what you are asking about.

There is also a thread here in SuperUser that has a nice discussion about the process.

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Thanks for the great answers but for anyone who is interested, I managed to pull this off using isolinux and wimboot from iPXE. Then /boot/isolinux/isolinux.cfg setup was as follows:

label 32-bit
menu label Windows 7 and up
com32 linux.c32
append wimboot initrdfile=/path/to/bootmgr,/path/to/bcd,/path/to/boot.sdi,/path/to/boot.wim

This method worked for 32-bit and 64-bit Windows Install, Recovery and PE plus I didn't need to edit BCD entries for each version.

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