Advised macOS driver install for Pegasus Promis R6

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  • Last Post 4 weeks ago
Erwin Panen posted this 26 March 2025

Hi,

I'm in the process of newly installing macOS on a couple of 2018 mac mini's. 
I chose to do a new install to completely get rid of old stuff and settings that might cause trouble.

I have one system that has Ventura 13.7.2 at the moment, and another one that has Monterey (where I chose to do an internet restore, exactly to see what would be the macOS version that Apple would send to the mini) 
Purpose is to at least upgrade the Monterey one to a more recent macOS version.

On both 2018 mini's I have a Pegasus Promise R6 connected using thunderbolt, and the Apple thunderbolt converter cable thingie's.

Question:
1. Do I need to install drivers for the Pegasus R6?
2. If the Promise utility is installed, does it automatically install the / a driver too?
3. What version of driver would be recommended for these older Pegasus R6? (Possibly a link?)

The reason why I have doubts:
- on the Ventura system the Promise utility is installed
- on the Monterey system the Promise utility is not (yet) installed
=> both systems "see" / mount the Pegasus R6
=> on both systems I have regular messages like: Disk not ejected properly. Eject "Pegasus R6" before disconnecting or turning it off.
Disk not Ejected properly

For clarity:
- neither of the 2 mac mini's nor the Promise Pegasus R6 are turned off
So I gather it may have to do with (default) power saving settings? 

 

 

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R P posted this 5 weeks ago

Hi Erwin,

The 2018 Mac Mini is Intel, so...

Question:
1. Do I need to install drivers for the Pegasus R6?

No, Intel macOS comes with a Pegasus driver.


2. If the Promise utility is installed, does it automatically install the / a driver too?

The Promise Utility does not install a Pegasus driver.


3. What version of driver would be recommended for these older Pegasus R6? (Possibly a link?)

Intel macOS has a builtin driver, but it is compatible with the Pegasus 1 so there should be no problems.

Erwin Panen posted this 4 weeks ago

Hi RP, thanks for clarifying!

Any suggestions how to circumvent the "Disk not ejected properly" situation?
I usually try to plan for a reboot, but often this is not desirable..

Thanks for helping out!

Riot Nrrrd posted this 4 weeks ago

Erwin,

I have my Pegasus R6 connected to a Late 2012 Mac mini running macOS Mojave 10.4.6 via a plain Thunderbolt (Thunderbolt 1) cable, and it never ejects.

R P posted this 4 weeks ago

Hi Erwin,

Some very few Pegasus users have issues with the Disk Not Ejected Properly message, primarily with the Pegasus2. Most do not and I've never been able to reproduce it in the lab.

But this issue has been reported since Firewire days with Firewire drives and has been reported with every kind of storage, even SD cards left inserted when the mac goes to sleep. It is not an issue specific to the Pegasus. In one forum the user reported that the issue went away after a macOS update, but if you keep reading later he reports that it came back with the next macOS update. No one in any of these forums has a solution for this issue. The one simple workaround is to set your mac to not go to sleep.

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