Ultrastar DC HC550 integrates a suite of technologies on a 9-disk platform to create a new class of HDDs. 16TB capacity is achieved by combining technologies that improve areal density working together with technologies that improve performance and reduce power consumption. The HC550 drives are the first internal hard drives in the industry to harness Energy-Assisted Magnetic Recording (EAMR) technology. EAMR improves writability and therefore increases areal density. They also use a Triple Stage Actuator (TSA) which enhances head-positioning accuracy, delivering better performance and increased areal density