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"...(apparently, the M1 was a real winner)."

Not at the time it came out. :rolleyes:
There have been threads about this since day one of AS. With similar and different issues.
i.e. (Bandwidth taken away from data devices and pre-allocated for additional external monitors only even if they aren't being used...)

"The Apple tech told me these issues have been a problem since the M2..."
And probably will continue to be with M5 and M6 and 26 and 27.
Because Apple have settled on designs that appears to do one thing well (PCIe-based TB3/4/5) and fixing less high-speed protocols isn't a high priority.
Maybe? because it interferes with the optimum performance of the first?
So would never be a priority...

I mean, the introduction of AS brought the introduction of TB4, which 'tunnels' the USB 3.x signals in the TB4/5 40/80Gbps data stream.
This presumably imposed far more strict timing constraints on the parameters of the signal stream than older third-party USB 3.x chipsets are capable of conforming to?
Does imposing this strict regime on the data signal sent to or received from older external USB 3.x devices inherently cause potential problems?

The same sort of 'unfixable' set of problems seem to exist with HiDPI scaling on non-Apple monitors, particularly high resolution wide aspect 21:9 60Hz monitors.
Apple's hardware is designed to exactly support multiple XDR Pro Displays, and not a pixel more seems to be available except for the very specific HDMI 8K?
Which conflicts with HiDPI scaling on everything else non-Apple... ☹️

And which doesn't get fixed with each hardware and software iteration.
Because fixing it would require a different set of hardware design priorities?

Anyway. There are appropriate workarounds for most things.:)

Disclaimer: The question marks mean I have no real knowledge about these things, but am trying to work out the big picture?
 
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I'm not fighting it. I'm waiting on a solid dot release. I work off a lot of professional A/V software and I cannot take more time right now if there's an issue with Tahoe or an incompatibility.

Besides, there's no guarantee it will solve *anything*. The Apple tech told me these issues have been a problem since the M2 (apparently, the M1 was a real winner).
I can tell you with looking the state of Tahoe since early beta to now, it is likely the entire macOS 26 is deemed production not-ready by many professional environment. Do not update your mission critical Macs to it, whatever bug(s) on Sequoia or earlier are small problems compared to the cluster**** that is Tahoe.
 
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I can tell you with looking the state of Tahoe since early beta to now, it is likely the entire macOS 26 is deemed production not-ready by many professional environment. Do not update your mission critical Macs to it, whatever bug(s) on Sequoia or earlier are small problems compared to the cluster**** that is Tahoe.
I agree, and am full of regret for upgrading to Tahoe. The machine loves to crash now, in particular when running multiple monitors and I have my back SSDs connected.
 
Isn't the issue with multiple SSDs online, port power related?
As in, there isn't enough power to have more than two drives online?

I, and others can confirm, that for the Mac Mini, this is the case.
You cannot have more than two drives online at the same time.
In my case, I now have a corrupted user profile, sigh...

This would then be a hardware problem, not able to be patched by firmware/software?
 
Isn't the issue with multiple SSDs online, port power related?
As in, there isn't enough power to have more than two drives online?

I, and others can confirm, that for the Mac Mini, this is the case.
You cannot have more than two drives online at the same time.
In my case, I now have a corrupted user profile, sigh...

This would then be a hardware problem, not able to be patched by firmware/software?
I only have 2 SSDs connected all the time, one via a Studio Display, and one directly to the Studio. Any thumb drives that I plugin go through a dock.
The crashes happen when I turn on to use a 2nd, or 3rd screen along the way. For e.g., I just a had a crash as I reoriented a second display - portrait and was switching the direction of the cables hanging off, rotating it from 270 degrees to 90 degrees. The OS stalled and the display went on / off / on / off in a loop, then crashed. After the reboot, it wouldn't start with the SSDs connected - so had to unplug them first. Then booted, ran disk utility to check the hdd, checked things were clear, rebooted again to confirm it's fine, then turned on the screen and adjusted the rotation.

Tahoe needs to fix such bugs.
 
@buggz ”Isn't the issue with multiple SSDs online, port power related?”

Yes. But that isn’t ’the’ issue, it’s yet another issue…
Affecting TB3/4/USB4 bus powered SSDs. The devices work well, just not more than two.

But @evatar had problems with ’incompatibility with Thunderbolt 2 devices, USB 3 drives, and USB-C connections.’
These are more intractable…
 
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@evatar "...I've worked on projects that have 16 drives attached. What the hell is Apple thinking?!?!?"

Apple has done what they have always done since they introduced fast/wide SCSI ports, with connections for up to 15 HDs. Per SCSI chain. Which was four per Mac Nimbus slot x three Nimbus slots when Steve Jobs came back to Apple... 😵‍💫

You. provide. external POWER. to. as. many. HD/SSD enclosures. as. you. like.
And. You. Can. Connect. As. Many. As. You. Need.

Put a TB4/5 hub or TB3 daisy chain on Every Single TB4/5 port, and you can attach a full TB3 daisy chain limit of 5 (TB4/5 hub) or 6 TB3 externally-powered enclosures PER Mac TB4/5 Port...

God knows whether a Mac Studio Ultra will actually support 36 external SELF-POWERED enclosures (each with up to 4 NVMe slots) but simplistically it will...
Whatever the MacOS address limit is.
"Same as it ever was?!?!?"

For TB4/4 USB4/4 V2 enclosures, they are not daisy chainable , so only 3 enclosures per TB4/5 hub - one per port (+ any internally in the dock). But the multi-NVMe slot enclosures are available, so that's not a real limit...
 
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