I have 2 Western Digitals, 1x Blue, 1x Green, Models WD5000AZRX and WD5000AAKX.
They are from 2010-2014 (2010/2012 or 2012/2014) from what i could find.
Their cache is 32/64MB, while the Maximum sustained speed is 150MB/s.
I then check the WD10EZEX, which is a 1TB drive, from supposedly this year.
To my surprise, the performance is identical as those from 5-9 years ago. 64MB cache, maximum sustained speed is 150MB/s.
It seems to me, over the years manufacturers have only increased capacity (density), but not performance. Why is that? Same is with the rest of the drives, at different sizes. Same is with the WD Black, Purple, Red and so on.
performance goes up with capacity, there's only so much you can do without either increasing the platter count or increasing RPM.
the Western Digital Black 6TB (WD6001FZWX) is 220MB/s sustained (as are the Toshiba X300 5TB and 6TB).
Another way to put it is that we're pretty much at the physical limits of rotating platter drives. The rapid density increase a decade or so ago and the increase from 5400 to 7200 RPM (and the 10k Raptors) both helped performance quite a bit, but both density and rotational speed are at or close to peak with the materials we have available right now.
They could put out 15k rpm scsi drives but what motherboard would be scsi and what not. This is all you can get with spindle technology. Move on to SSD..... I had a cheetah 4GB on a ASUS P2B SCSI and she was 10k ,, very fast, great with windows 98 lol