I just bought a ssd to change with current hdd. So, I decided to copy whole 750 gb partiton (of course used part of it which is approximetly 76 GBs) using "dd" utility. However, I entered this command:
sudo dd if=/dev/sda5 of=/dev/sdb1
(since partition I mentioned was defined as "sda5"...) I was expecting it to copy these 76 GBs fully, but it finished copying that part; Moreover, is's still maintains copying other 674 GBs null. I wasn't expecting this result. When I enter
sudo pkill -USR1 -n -x dd command, It says: "505029097+0 records in
505029096+0 records out
258574897152 bytes (259 GB) copied, 39871,3 s, 6,5 MB/s"
So, if somebody can explain this situation to me, I would be really satisfied.