Need to know write and read speed of Wd black 6tb hELP

6TB is pretty large, and probably expensive for the WD Black model.

If it's for STORAGE then I'd look for a cheaper, slower drive since speed doesn't matter (for one thing, I have mine set to power down so when I occasionally access stuff there's a delay to spin up). Even for gaming, the load times won't me much different versus a slightly slower modern hard drive.

And for where PERFORMANCE really matters an SSD would be better.

I honestly have a hard time thinking of scenarios where I'd personally justify the cost of that drive. It's $280USD and you can buy a 4TB WD Green drive for $130.