Can't understand this really. bought couple new Samsung F3 single platter 500Gb drives. Both are from same batch both carries the same firmware, but other drive read's 146MB/s while other only 131MB/s same sectors/parts of the drive. I even switched them to test with same SATA cable and port so it ain't the cable and it ain't the port. I'm just wondering does these devices have a soul or how is it possible with identical equipment?