In reply to a post by Pheasant:

Just proves that as long as you put a Samsung SSD in the right box it will write well 🤣

LOL, Apple remains insanely picky about accessories... something USB (any version) was supposed to correct. Sigh.

At the very least there’s clearly something going on with Apple’s support for USB 3.2 Gen 2x2 under Thunderbolt, at least with that Samsung T9 drive. I could probably spend the best part of an evening googling it. Might even be a limitation within the Thunderbolt (3 and 4) implementation itself that I’m not aware of.

To be fair to Apple, I’ve proven that with an accessory labeled USB 4 it it passing data at 40 Gbps, at least with Thunderbolt 4 equipped machines. I haven’t checked with earlier Thunderbolt 3 only machines.

I don’t think I can be bothered now to chase up with 🍏 why the T9 drive only transfers at 10 Gbps on USB 4. Their response will be quite predictable.

I can test later on with some new Thunderbolt 5 equipped Apple hardware to see if USB 3.2 Gen 2x2 throughout has improved, from Thunderbolt 3 and 4, gets the full 20 Gbps, but my expectations are low.

Will see.

In reply to a post by Pheasant:

At the very least there’s clearly something going on with Apple’s support for USB 3.2 Gen 2x2 under Thunderbolt, at least with that Samsung T9 drive. I could probably spend the best part of an evening googling it. Might even be a limitation within the Thunderbolt (3 and 4) implementation itself that I’m not aware of.

Fascinating as the iPhone 15 Pro/ProMax, and the 16 Pro/ProMax claim to support 3.2 Gen 2x2, whereas the 15/Plus and 16/Plus only support USB 2 protocol over the C connector. I think the new iPad Mini 7 is the same; but the iPad Pro models with M1 and later are Thunderbolt 4/USB4

To be fair to Apple, I’ve proven that with an accessory labeled USB 4 it it passing data at 40 Gbps, at least with Thunderbolt 4 equipped machines. I haven’t checked with earlier Thunderbolt 3 only machines.

Good to know it works.

I don’t think I can be bothered now to chase up with 🍏 why the T9 drive only transfers at 10 Gbps on USB 4. Their response will be quite predictable.

Agreed.

I can test later on with some new Thunderbolt 5 equipped Apple hardware to see if USB 3.2 Gen 2x2 throughout has improved, from Thunderbolt 3 and 4, gets the full 20 Gbps, but my expectations are low.

I see PCPro magazine's Jon Honeyball was discussing a Thunderbolt 5 cable in their weekly podcast last week. Insanly capable speeds.

In reply to a post by jchamier:

I see PCPro magazine's Jon Honeyball was discussing a Thunderbolt 5 cable in their weekly podcast last week. Insanly capable speeds.

Along with the OWC drive above, I ordered a couple of OWC's own-brand Thunderbolt 5 cables. In theory one could connect two M4 Pro / Max machines together and get bidirectional 80 Gbps with IP over Thunderbolt between them 😂

I believe TB5 will run up to 120 Gbps unidirectional.

Edited by Pheasant (Thu 14-Nov-24 22:10:05)

You keep saying FireWire, I assume you mean Thunderbolt 😉

Apple don’t claim to have USB 3.2 Gen 2x2 support:

https://support.apple.com/en-us/111835

I do. My bad. Apologies.

My brain often still thinks in FireWire terms. Thunderbolt. Thunderbolt. Thunderbolt. Is that like Bettlejuice? 🤣

Apple claim that the new M4 Minis have USB 4 ports. USB4 is mandated to be compatible with USB 3.2 Gen. 2.

But I think you are correct that there is no claimed support on earlier models.

They have claimed USB 4 (up to 40 Gbps) with every Apple Silicon generation that I'm aware of.

You are correct that earlier boxes (M1 and M2) were additionally listed/noted as supporting "USB 3.1 Gen 2 (up to 10 Gbps)" - irrespective of whether they had Thunderbolt 3 or Thunderbolt 4 ports.

However I also tested on an M3 Max box which in the Apple spec. simply say "...USB 4 (up to 40 Gbps)". There is no longer any separate mention by Apple in the spec for these machines for any USB 3.x support whatsoever. Ditto for the latest M4 boxes.

Edited by Pheasant (Fri 15-Nov-24 14:19:50)

Ah, then they are non-compliant iwith the USB specifications.