Promise Pegasus3 - not mounting on Modern Mac?

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Florentin Constancias posted this 2 days ago

Dear Promise support,

I’m using a Promise Pegasus3 R8.

Since switching to Apple Silicon Macs, the device hasn’t been functioning properly. I’m currently on an Apple M4 MacBook running macOS 15.3.1 (24D70).

The driver appears to be installed successfully:
systemextensionsctl list | grep pegasus
*    *    268CCUR4WN    com.promise.driverkit.pegasus (21.1.0/1)    com.promise.driverkit.pegasus    [activated enabled]


What’s strange is that when the Pegasus starts up, I can briefly see and navigate the files, but within a few seconds everything freezes, and I get a "Disk Not Ejected Properly" error. This is very frustrating.

The hardware (including cables and drives) works fine, as I’m able to access the files using an older Intel Core i7 Mac running macOS Monterey 12.3.1 — although it only runs in Safe Mode and doesn’t recognize any USB hard drives.

Any support on this issue would be greatly appreciated.

Once this is resolved, I’ll need some guidance on a follow-up problem: after forcefully removing one of the disks out of frustration, I received a “Logical drive set to critical” message. However, I can still access all the data using my old Intel-based MacBook.

 

Thanks for the support,

 

Best,

 

Flo

P.S.: I had posted about this issue before, but I can’t seem to find the thread anymore.


 

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R P posted this 2 days ago

Hi Florentin,

My best guess is that your Pegasus 3 has very old firmware. Since you have an Intel mac, it's best to check and if necessary update the firmware from the Intel Mac.

Florentin Constancias posted this yesterday

Thanks for your reply. I do think I did that already. Please find enclosed the alllogs attached to the previous message - hope this is what we need to confirm your hypothesis !

 

R P posted this yesterday

Hi,

Please upload a service report. Note, you will have to zip the html file or you won't be able to upload it.

Almost every macOS is causes problems for some users, but Sequoia (15.x) has brought some unusual issues to some few macOS users. That is, for some reason, the Pegasus may only work in some specific thunderbolt port or some few thunderbolt ports, but not all of them. Which port any thunderbolt device is plugged into should not matter, but right now it might. The suggestion is to try different ports and see if you find a port that it works at.

Also, not all docks are created equal, if the ports are labeled 40Gbe with no Thunderbolt near the port, it has not been Thunderbolt certified and may or may not work with any specific device. If you are connecting through a dock, as many do, try connecting the Pegasus directly to the macbook. I have not seen the new M4 macbooks, but I believe they have 3 TB4 ports.

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