Mac Pro doesn't mount PCI internal storage after rebooting from Mac OS

one thing I notice is that by choosing FAT32 instead of exFAT, you are limited to max 4GB file size on that Windows drive, and may be at the maximum size drive at 2 TB (without talking extraordinary steps in formatting). I don't EXPECT that would confuse MacOS, but 'ya never know'.

I don't see any other handles to pick this problem up with, so I recommend you use this little "discovery" Utility, Etrecehck, to look around inside your Mac and create a report, suitable for sharing back to the forums.

Using EtreCheck to Troubleshoot Potential… - Apple Community

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Mac fans respond to measured temperatures. So that blower fan is probably seeing the substantial heat from that PCIe SSD card.

It's not an accident they want you to apply the thermal tape and heatsinks, and the card slot cover has its own air exit grille to encourage hot air exit.

In the case of overheating, what is said to happen is that the individual SSD drives slow down, and performance (but NOT appearance/disapperance) suffers.

You are not alone. I have the exact same issues (internal NVME storage failing to mount, top blower fan suddenly spiking) with very similar hardware (Sonnet, Samsung EVO, MacOS RAID) and there are plenty of other Mac Pro 7,1 owners with similar issues with internal NVME storage. Also it worked fine for me for an extended period of time before starting to become very unreliable. Nobody, to my knowledge, has ever gotten this sorted ... the only known workaround is to hard boot the machine until the storage mounts properly.

The hard boot approach does work after a few tries; however, it can and does cause corruption of a variety of things.

Has anybody gotten any further with this?

It seems a random drive disconnect is common to both the 2019 and 2023 Mac Pro models. This is with and without RAID.

I've had a look around and it seems to happen regardless of drive carrier switched and unswitched, (I personally have been through Sonnet, Startech and Lycom and I know others that have Highpoint and generics that suffer the problem.

Also the drive seems not to matter, Corsair, Samsung, Sabrent amongst others.

j'ai deux cartes NVME en solo sur bootcamp cela fonctionne (attention il faut choisir la bonne option pour windows) sinon effectivement ce fait tourner le ventilateur de trop et cela fait planter les donnée semble t'il.

Parcontre une remarque c'est que bootcamp ne reconnais pas les cartes nvme en mode raid car il le prend en mode disk dur externe...

A suivre j'ai quelques idées en tête mais à voir ...

Belle journée,

More here - https://discussions.apple.com/thread/255339675?sortBy=best

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what PCIe card?

what drives including sizes and maker?

organized how? what driver {softRAID, Disk Utility, other: specify}