WD120EMFZ = US7ASP140 = Western Digital Ultrastar DC HC530if one of them are SMR drives.
Designed to handle workloads up to 550TB per year, the Ultrastar DC HC530 is based on conventional magnetic recording (CMR) technology for drop-in simplicity in enterprise and cloud data centers.
WD120EMAZ = US7SAM120 = Western Digital Ultrastar DC HC520
Designed to handle workloads up to 550TB per year, the Ultrastar DC HC520 is the industry’s first 12TB drive and uses traditional perpendicular magnetic recording (PMR) technology to make it dropin ready for any enterprise-capacity application or environment.