Hi, I use AOMEI Backupper Standard to clone from a 250GB HDD in Dell E6410 Windows 7 laptop to a 120 GB Kingston SSD. I chose disk-to-disk cloning. I couldn't choose sector-by-sector cloning because destination drive is smaller than source drive. The Hitachi source drive only has a total of about 80 GB used up, including both System Reserves and C:\ partitions, that's why I chose to clone to a 120 GB SSD. After AOMEI Backupper says cloning is successful, I replaced the 250 GB HDD with the 120 GB SSD. I then got into BIOS and changed from SATA to AHCI before rebooting. The laptop screen then says to the effect there's no bootable device. I would very much appreciate your suggestions. Thank you.