I ran a benchmark test on the drive and the results appear normal, but when I try to actually move/copy files its very slow.
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Benchmarking this WD as external with Black Magic speed in OS X Sonoma only gives about 900Mb/s write/read speeds. Files transfer is extremely slow compared to those results (42Mb/s).
Read this post over more closely and I suggest slowing the transfer speed is due to the SSD filing above 50% which forces the controller to slow writes. I discovered this when moving steam games galore from various other storage devices
I have one SN580 2TB at present anda few SN350 2TB storage devices