USB4 SSD not detected when connected directly to M4 MacBook Pro

[Ber92]

Hello,

About 4 months ago I bought a brand new 2024 M4 MacBook Pro. I also just received a new Corsair EX400U USB4 SSD to backup my files from my old Windows PC.

The Macbook Pro, however, doesn't detect the SSD when I connect it using the included USB4 compatible cable. It doesn't show up on disk utility. I tried all 3 USB C ports to no avail.

Corsair says it is compatible with MacOS 13 and later versions.

The drive works, using the same included USB cable, with my IPhone 15 Pro, my old Windows 7 PC, and with my work issued Dell Precision 5570 with USB C ports that support Thunderbolt 4 / USB4. I am not sure if it was in USB4 mode on the 5570.

I tried to connect it using a borrowed Dell DA305 USB-C mobile adapter and it worked. I was able to access the files that I backed-up.

I have managed to get the system logs when I connect the SSD (without the USB Hub) using this command :
"log stream --predicate 'eventMessage contains "USB" OR eventMessage contains "Thunderbolt"' --info"
They are in text file attached to this post.

Any insight will much welcomed and appreciated.

(Sorry if I chose the wrong section of the forum to post this, I am new here)

 

[MayflyMaven]

I would check System Settings > Privacy & Security > (scroll to the bottom) Security: Accessories. Even at the "highest" security ("Always ask") it should be prompting you to allow the accessory. I'd at least temporarily try "Always allow", then detach/reattach the device to see if it shows up.

 

[DeltaMac]

Do you have any other USB devices that you could try, maybe a flash drive?