MultiBoot Large USB HDD

Shapoor 23/03/2015
I have a External USB HDD, SeaGate Expansion Desktop, 4TB, 4k/512e, USB 3, I like to create a relatively small partition within, for example 20GB, and make it a multi boot external USB hard disk an load planty of intallation files, on it and instal Windows from it. I want to have other partitions beside the above mentioned 20GB, and use them for regular storage tasks. I tried "Make_E2B_USB_Drive" script, but when it wanted to format the drive it issued and error and stopped. I also tried RMPrepUSB, it also issued an error, "parameter 1 is incorrect", or something like that. Now, I want to ask is it even possible to have such thing?
Thanks for your attention.

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