Performance of SSD disks on Mac Mini M1 per USB 3.2 gen 2

I’m not responding to every claim or counter-claim other than to address your issue with your Samsung drive’s performance/bug/quirks in their USB implementation. It needs to be directed to them first. If they won’t address it directly or respond comprehensively, which is clearly the case here, you should take it up further with them or await a manufacturer with a product that does that. All the best.

I think it is difficult to convince certain people that this issue exists no matter what data is presented. I hope in the future Apple makes an OS or hardware change to address. Until then I guess we live with this or just use TB drives to achieve max speeds if that is important.

That, Forced_to_use_a_username, literally, changes nearly nothing, from what I stated concerning the USB-C connectors, that are running USB4. All you need do is look up the USB4 specification.

It does, however, indicate that the USB-A ports are less capable than I thought. (I don’t expect much of such ports anyway.)

When you check the USB4 specification, you will see which “USB 3.1 Gen 2 (up to 10Gb/s)” is supported.

Forced_to_use_a_username:

For the USB4 standard, I recommend the ZIP file found at https://www.usb.org/document-library/usb4tm-specification.

Note: Support for the USB3 protocols is obtained via “tunneling”, just as for a number of other protocols. This can severely limit direct compatibility, especially through intervening non-USB4 devices (such as non-USB4 hubs). In addition, this can mean that the negotiated protocol may well drop down to the common USB2.

I recommend you start at page “-11-“, for an Overview and System Description.

Forced_to_use_a_username wrote:

Apple states that USB 3.x is supporterd "up to 10 Gb/s" which may to true, but it is - as a fact - not true for both of the variants that allow to reach 10 Gb/s ....

Only ONE of them is supported in M1, [while] BOTH of them are supported for older Apple hardware.

Even the «USB 3.x … supporterd "up to 10 Gb/s"», on the USB4 ports, may not be supported via anything direct, but via the “tunneling” I mentioned. (To do otherwise would seem to be an extension of the USB4 specification. Certainly not impossible, however.)

Additionally, while «BOTH» «USB 3.x … supporterd "up to 10 Gb/s"» «are supported for older Apple hardware», that’s only because the USB-C ports on such «older Apple hardware» are using the older USB3 standard. Not the newer USB4 standard.

Given time, more third party products will move to the new USB4 standard.

Why not open a fresh discussion with your disks connected and ready for testing and let’s see where the problem really is. If you’re up to it, be prepared to have an open mind and keep the discussion technical and limited to your particular issue so folks here can help. Think about it. You may not arrive at a solution this way but you might have better information to pursue one. All the best!

Forced_to_use_a_username wrote:

If the USB4 port are just USB4 and not fully and really capable of the existing USB3 standard, Apple should state that.

Exactly this is, what I am constantly repeating.

But Apple did not make that public, for whatever reasons.

And this proved to make many problems for many customers of them!

You could just as easily blame Samsung and their T7 spec for not specifying that to achieve their claimed transfer speeds, a dual lane USB controller is required, which they make zero mention of. Actually, any SSD vendor could be blamed if they require two lanes to achieve their speed.

Actually, they’re using UASP which allows the drive to acknowledge tasks as completed towards the computer even though it’s outstanding on the drive side. So: fake performance, fake boasts, fake comparisons, fake accusations. What an industry! Go figure 😂

hcsitas wrote:

Actually, they’re using UASP which allows the drive to acknowledge tasks as completed towards the computer even though it’s outstanding on the drive side. So: fake performance, fake boasts, fake comparisons, fake accusations. What an industry! Go figure 😂

The "numbers game" and "creative advertising" have been going on for decades in anything electronic and will likely continue.

In some ways, the USB specs evolution from the simple 1.1, 2.0 and original 3.0 almost seem to been made deliberately confusing and complex to allow vendors to get "creative" in their claims.

Try "Product and Service Support" at > https://www.apple.com/contact/

What TB Dock are you using?

Does the T7 speed improve if it is connected directly to the Mac Mini using the supplied 3.2 cable?