I copied a 2.89 GB file from my 2017 MacBook Pro (through USB-C, running Mojave) to my new My Passport Ultra for Mac 4TB. It takes 34 seconds. I tried this a few times and it usually takes around 34 seconds. This equates to approx. 85 MBps.
I have an old WD 4.0TB SATA WD40EFRX hard disk connected through an adapter to the USB-C port on my Mac. I copied the same 2.89 GB file from my Mac to this WD40EFRX. It takes 17 seconds. This equates to approx. 170 MBps.
Why is My Passport Ultra for Mac so slow?
I tried the copying with the Sleep Timer and LED turn on and off in WD Drive Utilities. I got the same slow speed.
