WD HDD Family: VENICER Example models of WD PCB 810011 SMR HDDs: WD20EZAZWD40PURX-64AKYY0WD40PURZWD40EDAZ-11SLVB0WD40EZAZ-00SF3B0WD40EFAX-68JH4N1WD40EMAZWD60EDAZ-11U78B0WD60EMAZWD60EFAX-68JH4N1 Example models of WD PCB 810051 SMR HDDs: WD22PURZ-85B4ZY0WD22PURUWD22EJRXWD42PURZ-85B4YY0WD42PURUWD42EJRXWD63PURZWD63PURUWD63EJRXWD64PURU PCB: 810011 810051