This is the first time I use the dd command.I execute:dd if=/dev/sdb2 of=/mnt/sdc1/Hdd1.img bs=512 conv=noerror,syncWhere the sdb is the destroyed hdd (size: 500 GB).I copying the partition sdb2 into an image. I've done it 6(!!) days. the img size is about 640 GB and still counting (i.e: it hasn't finished yet...). 6 days it's printing the copied data details (which byte it's copied to where) and it's not stopping.Is it normal? how is it possible that the img size is larger than the whole destroyed hdd size? and when it suppose to finishing? 
How large is the img that dd creates?
hard disk;dd