USB3 hard drive not recognised by M1 MacBook Pro

I have a “3.0TB OWC Mercury Elite Pro With USB+1 Storage Solution” that I bought in late 2015 that was for many years my iTunes library drive. For the last year or so I’ve just had it turned off but decided today I would wake it up with a view to repurposing.

The problem is my M1 MacBook Pro utterly refuses to recognise it as a hard drive. It does show up in the System Information app on the USB bus, and this is true with the many different ways I have tried to connect it:

  • USB3 cable (as supplied with the unit) to OWC USB-C Dock (USB-C to MBP)
  • USB3 cable to StarTech USB3 travel dock (USB-C to MBP)
  • USB3 cable to Apple (USB2) multi-port adapter
  • USB2 (B-to-C) cable direct to MBP

I don’t have a USB3 B-to-C cable to try. Note that the drive shows up on the USB bus in System Information with all of these connection methods, but never in Drive Utility. Note that this drive has external power and on/off switch and reliably spins up when I turn it on.

I then plugged it in using the USB3 cable to my Mac mini (where it used to reside in its working days) and the drive shows up in Finder straight away.

I have a feeling I encountered problems with another device that would only work with certain methods of connection but I think that was a bus powered drive and I was able to make it work through the StarTech dock.

Any thoughts? I’m getting the feeling it’s an M1-USB “thing”.

I’d try OWC Customer Support. From everything I’ve heard they are very responsive.

1 Like

I would think you would see something in Drive Utility if this was the case, however just in case a long shot pays off… The drive isn’t formatted as NTFS is it? Perhaps in the distant past you installed something on the mini to allow it to manage NTFS formatted disks and need to replicate that on the M1?

Thanks that was not something I had thought of. But alas no. It’s a GUID partition map with a single HFS+ partition. Time to head to OWC support.

Ah - well, it was a long shot! :wink:

Hope support gets you back up & running!