Thanks for keeping up your good work, Lawrence.
With reference to your conclusion, you wrote that: "The 1TB model in particular should be avoided as it is plagued by unusual seek activity. After some of our tests, it would seek for an inordinate amount of time and when it finally stopped, it would continue to seek less frequently in short sporadic busts, delaying headparking and motor spin-down."
I recently purchased 1TB WD10EZRX and 2TB WD20EZRX (Green, will become Blue, 3.5"): particularly about the 1TB model (but the 2TB also to some degree) I disappointly registered the same, identical defect of that 1TB 2.5 SSHD, which make those drives actually insuitable for SPCR-like rigs.
Has anyone else found that indesiderable behaviour on smallest capacity recent 3.5" WDC drives (either Green, Blue, Red)?
In case, did you disabled the auto-parking "features" using the known utility wdidle3?