"Thanks. Had no idea WD had started using SMR on their Red drives." - petep2112
WD has been secretly submarining SMR into drives for the last year while refusing to answer questions. It finally got be a big enough scandal that WD has finally given some specific affected models as of today:
This drive, with the EFRX suffix, is (thankfully) a CMR drive. You can also look at cache size - 64MB for the CMR drive and 256MB for the SMR. The EFAX suffix indicates (at least right now... who knows how they'll obfuscate it in the future...) and the use of the larger cache to cheat on speed are indicative of the SMR line.
Comments & Reviews (5)
Red:
WD20EFAX
WD30EFAX
WD40EFAX
WD60EFAX
https://www.tomshardware.com/news/wd-lists-all-drives-slower-smr-techNOLOGY
Thank you!