Pegasus1 and macOS 10.14 Mojave?

  • Last Post 03 May 2020
Marco Duering posted this 09 November 2018

Before updating I would like ask if the 1st generation Pegasus still runs under macOS 10.14 Mojave?

Many thanks,


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arunkumar b posted this 09 November 2018

Hi Marco,

We are sorry for the inconvenience caused to you.

Pegasus1 is a legacy product .It may or may not work with latest release Mojave.




Marco Duering posted this 09 November 2018

Thanks for your quick answer. So far no inconvenience caused. I'm asking before updating ;-) 

If Mojave is not offivially supported, what is the latest macOS version officially compatible with Pegaus1? Sierra or High Sirra?

Marco Duering posted this 09 November 2018

Found it in the compatibility list. Seems 10.11.3 is the latest supported version.

Marco Duering posted this 09 November 2018

Any users with experience regarding Mojave and Pegasus1?

Steve Jacobs posted this 15 July 2019

I have a Pegasus 1 R-6 running El Capitan 10.11.6 and my Promise utility still works, but because this is a legacy product, it probably won't if I upgrade to Mojave.  

Cleve Cooney posted this 16 July 2019

I running a Pegasus 1 R-6 with High Sierra 10.13.6 on my problems.  

Mark Bealo posted this 25 July 2019

Any users with experience regarding Mojave and Pegasus1?


Crashes and automaticly shuts down while copying files. I'll get about 20GB or so copied over then the Power saving mode of the Physical Drives is changed to ACTIVE and it shuts down. Array also gets Power saving mode changed to ACTIVE. Ugh.

UPDATE: I was transferring files from a portable Seagate Thunderbolt SATA adapter connected to the Pegasus R4. The 1TB SSD was REALLY hot to the touch, so I decided to try and find a solution that might eliminate the crashing. I put the 1TB SSD in a NewerTech VoyagerQ unit and attached it to my Mac Laptop via USB 3. Then the Pegasus was the only thing on the Thunderbolt connection. Now I can transfer files to the Pegasus... but so SLOW. Ugh. At least it is working. About 100MB/s write speeds so far. This will take a while...

Just bought a QNAP NAS, so hopefully I can get everything transferred, pull the drives out of the Pegasus R4, and sell off the unit. Moving to 10GbE.

Mojave 10.14.6

Peter Barona posted this 03 May 2020

I just updated to Mojave 10.14.6 and every single time I boot I get an error from the Array and the crash continues . Does anyone have any idea if this occurs in the newer models of the R6 ? Or is there a work around for this ? At first I thought it was the cable and now seems like its the hardware. I have called Apple and re installed the OS from scratch and still the crash continues .