ssd not recognised by Sonoma

the Grand Arbiter of whether a disk is working or not Is Disk Utility.

A drive that will not tell Disk Utility its Make&model, and a reasonable non-zero size/capacity, can not be used, repaired, or erased. if its cabling and power are adequate the drive has died.

while disk Utility is Open try a repair Disk while you are up. it may fix minor problems.

I've reported it to Apple and with Experts but they say I'm the only one in the UK with the issue - my issue is I have a Sabrent SSD 4tb and it's not mounting. I can see it attached in system reports under USB 3.0 but won't mount. Disk utility doesn't show it.....but it does show up on my iPad pro which I've not upgraded. So so frustrating - get a grip apple !!

if Disk Utility on your Mac can not recognize those features I mentioned, the drive can not be used on that Mac.

is the cabling and power adequate?

A lot of issue seem to happen right around the time of major upgrades. They are not always cause-and-effect, sometimes just a coincidence.

If the drive is not seen in Disk Utility, it can not be manipulated on that Mac in any way.

Not Mounted for use.

Not Repaired.

Not Erased.

I disagree. It’s showing on my iMac 27 and my iPad so can’t have died

Why would it stop mounting straight after the upgrade to 14.0?

Interesting- not even tried my Sony camera yet after upgrade