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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.

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Severus Tux
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    What filesystem is your pen, if not ext* you can try to add -bs=1m -count=5120 to dd command and it will create a 5GB ISO from the beginning of the drive. – Ivan Temchenko Mar 07 '16 at 09:50
  • @IvanTemchenko Thanks :-) It works. When I did count=800 (some other image of 773MB) It created 839MB file... which is fine BTW :-) But I am still searching for commands or tools (like imgburn for windows) which automatically detects Usedspace and creates the image. And also, If I create an image in this way (dd) and give it to my friend (uses only windows), he cant use it right? – Severus Tux Mar 07 '16 at 10:34
  • about the utility for windows - UltraISO can be the way 4 u. About the friend - if you can burn created iso, why can't he do the same? ) – Ivan Temchenko Mar 07 '16 at 11:26

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