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Subsequent testing on an M1 MacBook Pro and MacBook Air revealed the same speed increase. To double-confirm having a Thunderbolt display attached to an M1 Mac mini creates this speed boost, Brady performed the same test with another Thunderbolt 3-equipped display and found the same increase. When Brady switched the displays, the faster speeds followed the Thunderbolt display. Through the process of elimination, the only variable was that one of the minis was connected to a Thunderbolt 3-equipped display while the other mini was connected to a non-Thunderbolt display via HDMI.

As both minis should write to the same external drive at the same speed, Brady began investigating what could cause this anomaly. When connected to a 2TB OWC Envoy Pro EX, Brady found one of the minis wrote to the Envoy Pro EX at much higher speeds. One of our product dev team members, Brady Campbell, came across this while running some tests between two M1 Mac minis. You can get up to 67% FASTER write speed from a Thunderbolt-equipped external drive connected to a Thunderbolt port on an M1 Mac when you ALSO have a Thunderbolt display connected directly to the second Thunderbolt port on your M1 Mac. Well, we have some breaking news on this subject and you’re reading it here first on the Rocketyard Blog: It’s been widely covered in posts and videos how external drive performance is unacceptably slow with the M1 Macs. From performance benchmarking to inform you of your “best-bang-for-the-buck” OWC upgrade to determining which Macs can have double the amount of RAM than what the factory supports, you can count on OWC to be your trusted source for key insights. Our product development team is constantly taking a deeper look at Apple products-and our own-to see if we can uncover some hidden potential to help you get more from your technology investment. Testing products is a way of life here at OWC and has been nearly from day one. Read on, because we found something interesting… Not getting the write speeds you were expecting with an external drive on your M1 Mac? You’re not alone.
