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,

Thanks!!

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”.