Hi,
I have bought a a hard drive WD 6TB Red WD60EFRX. The transfer data rate for big file 9GB game is between 25-50MB/s (smaller files like music when the file size is 4-8MB the bulk transfer speed is reduced to around 10MB/s) . It’s extremely low if I compare to my other hard drives, example WD 4TB Red WD40EFRX is around 130MB/s, WD 2TB Green WD20EZRX around 95MB/s.
PS. I setup default cluster, then change for 64KB and always the same speed.