I am trying to get an ISO file from a bootable USB memory stick. The device name for the stick is
dev/sdf1. In this answer: Convert bootable USB to ISO file ,
dd was suggested for copying. So I did:
sudo dd if=/dev/sdf1 of=win7.iso
However, the stick has a size of 30G, but only 12G are used. Running the command above, it creates an iso image larger than 12G, I stopped
dd when the file was > 20G, since I ran out of disk space.
Is it normal that the ISO file gets so big or is there another way to achieve my goal?