MacBook Pro 2018 Target Disk Mode - Fast Transfer Rates
I wanted to let you know that booting up the MacBook Pro 2018 while holding the T key down will put your MacBook Pro 2018 in Target Disk Mode. Using a stronger USB-C cable than the Apple white charger USB-C power cable, your other Mac, like an iMac will mount the drive and then you can transfer computer to computer and wow is that fast. I moved a 64 GB file in 1 minute and 35 seconds from iMac Pro 2017 to the MacBook Pro 2018 which was a lot faster than San Disk Extreme as a middle man.
Hope this helps...
MacBook Pro (15-inch, 2018), macOS High Sierra (10.13.6)