Creating an ISO from a bootable pendrive (only the used space)

I have a 128GB bootable pendrive with Windows Live on it.
I wanted to create an ISO image of this pen-drive so that I can create a bootable pendrive later.

This question might seem to be [Duplicate] of Convert bootable USB to ISO file,
but from the solutions given (dd and gnome-disks), it creates a 128GB ISO file,
even though the used space is only 4GB.

Is there any way to create an ISO of only used space (4GB)
and later make a bootable pen-drive from it?
I am using Ubuntu 15.10.

3 Sorted by: Reset to default

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