Just to update. I received the replacement drive. Fortunately, it performs just as well as the good drive. Love amazon customer service for allowing me to replace the drive twice, both times with overnight shipping.
I agree, these are not enterprise grade drives. It is just strange to encounter such high disk-to-disk variation.
The platter count is interesting because that might explain the differences in performance. However, I think platter count should also affect read speed which is the same...
I did do a full disk write and read using dd. No smart errors were reported. I also did a short smart self test on the bad drive. It reported no issues as well.
I'm thinking I'll RMA for a replacement drive and try once more. If it doesn't work out, then I'll just RMA both and look for a...
I have two 2TB WD20EARX drives. In testing, one drive does not perform as well as the other. The weaker performing drive operates fine otherwise (no smart errors).
To eliminate any cabling/other hardware issues, I've swapped the sata ports and cables between the two drives. The weaker...