WD Buy HDD new

WD Internal Drives Desktop & Mobile Drives
1

Hello
Happy new year everyone.
I want to buy a new HDD. But, how can I discern who is blue or green from name WD?
I ask because WD christened blue several of the green series with their code you discern who is who.

Thank you

2

WD has not made green series disks for quite a while. Now the blue series are their lowest cost disks. Recently in Canada the 4TB disk is $99 shipped after more discounts.

3

I looked on website newegg about WD Blue model WD60EZAZ vs WD60EZRZ that they have got difference cache but the model WD60EZAZ has got $128.99 and other WD60EZRZ has got $145.57? Why the WD60EZAZ has got low price?