Pegasus2 R4 Mounting Issues on MacOS 15.2

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  • Last Post 2 weeks ago
Ben Broad posted this 2 weeks ago

I have a Pegasus2 R4 unit.

It works on my 2018 Macbook Pro, but not on my 2024 Macbook Air (M3, MacOS 15.2). 

I am connecting it via a Thunderbolt 2 to Thunderbolt (USB type C) connector. 

I followed the instructions published at https://kb.promise.com/thread/installing-the-macos-pegasus-dext-driver/ 

I ran systemextensionsctl list | grep pegasus which returned [activated enabled]

The drive mounts briefly and I can see the files. It unmounts after about 20 seconds.

While troubleshooting I noticed the Thunderbolt cable was very hot at the drive unit end. The drives remained lit up (blue) after the cable was disconnected and remained so until I removed power.

R P posted this 2 weeks ago

Hi Ben,

The usual suspects in cases like this are...

  • A bad or intermittant Thunderbolt cable.
  • The power supply is going bad.

The cable is easy to test, try another cable.

The power supply is a bit more difficult. One test is to power down the Pegasus, remove the power cable, then unseat all the drives, pull them out maybe 1/2 inch leaving them in the same slot, then plug the power cable back in and see if the Pegasus will power up and stay powered up without the drives. If it does then the power supply is getting weak. Shut the Pegasus down and remove the power cable and re-insert the drives. Then plug the power cable in and boot it again. Sometimes after this test things work OK, so it's worth a try.

Note: Be sure that the Pegasus is powered down and the power cable removed before unseating or reseating the drives.

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