Internal hdd transfer rates

I recently bought a wd green 4tb drive.  I’m transfering 644gb of movies to it from a wd black 1tb.  The transfer rate is about 33MB/s.  I’m pretty sure this is slow.

What reasons could there be for such a slow transfer?

oooops,  I  thought i was transferring from a wd black.  But i was transferring from an old old, very old mybook… mybad.

the wd green’s write speed is steady at 89MB/s

You can try testing the drive for problems with Data Lifeguard Diagnostics.

How to test a drive for problems using Data Lifeguard Diagnostics for Windows