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Okay, a little more digging and I noticed on all WD drives the last 3 digits of the R/N corresponds to the drive size. All 10TB drives the R/N ends in 100, 8TB drives the R/N ends in 080, etc. That's a strong indication the WD120EMFZ is actually a 14TB model. I would wager instead of the HC530...

Also worth pointing out the WD120EFAZ and WD120EMAX also match using the same metrics. They are both R/N US7SAM120 5VDC 0.40A 12VDC 0.55A.

Regarding what the heck the WD120EMFZ is, someone posted this on SD: "I got 2 WD120EMFZ. The r/n is US7ASP140 which should be based on ultrastar dc hc530. From anandtech, it's a 14tb PMR drive (not SMR). WD probably firmware locked 2tb of spaces because of many reasons..." Not much info on R/N...

https://support-en.wd.com/app/answers/detail/a_id/25185

Can you post crystaldiskmark benchmark results for both models? I have a fear the EMFZ is a SMR drive. Someone on reddit posted CDM results for their EMFZ and it had random write speed 7x higher than random read, which can indicate SMR. I'm curious how benchmarks between the two models compare.