Yes scratching sound is normal on many fast drives. I hear same on all my wd black drives and raptor one. But if it is anything othere than scratching sound like small or big clicking sound, then you must call your computer h/w engineer or take it back to seagate service center(dont forget to backup your data). Your speed is also normal as a sata 3 drive. Also regarding sound if your cabby is not completely close/sealed and your cabby dont have ruber base on hdd try or you directly screw your drives to your cabby then you may hear sound more than a properly closed system with ruber base hdd trys which mostly absorbs the vibrations that produced by your hdd operations.