Slow read/write with on of my green 4 TB

Hello all!

I will try to explain bcs my english is not really good.

I own 2 hard drives , 4 TB’s greens and one of them is really slow (slow writes slow reads)

things I 've tried:

1- different SATA cables
2- differents SATA ports
3- Asus M5A78L-M/USB3 motherboard (SATA II)
4- asrock z77 extrem 4

And everywhere one of them is really slow at benchmarks,


it would be helpful if you could share the exact model number and firmware revision (As displayed in your diagnostics/benchmark app) for each drive. If there is a generational difference between your drives then performance differences should be expected even though both units are called “WD Green”.