Everything worked except copy command.As soon as i issued that command my device froze for sometime and gave some error messages about epiphany.After that It got switched of itself.When I edited chroot and started ED it complained of non existing image in said partition.Anyways Thank you.I will patiently wait for a new thread and dedicated partition related tutorial.
nice -n 19 cp -a /media/ed/* /mnt/debian-tmp/