Pegasus R4 won’t mount. Pegasus Utility GUI won’t display

  • Last Post 18 October 2018
Lorvin Brown posted this 06 October 2018

I restarted my Mac mini 2012 with High Sierra. Nothing in my Setup has changed. My R4 won’t mount and Pegasus Utility won’t display a GUI. I can only access Preferences. The drives are still all blue lit.  Please help. 

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Lorvin Brown posted this 06 October 2018

I am running v4.02.0000.17 of the Promise Utility. 

Franck Esnault posted this 15 October 2018

It's the same for me : Mac mini with OS 10.13.6. I can see the device in "About this mac" thunderbolt list, but the disks are not connected. The on/off button on the Pegasus is orange. All the disks are blue, exept one. Promise utility doesn't find the device at all.

Pradeep Chidambaranath posted this 15 October 2018


Kindly go to the link below to install the latest drivers to see if you are able to mount the volume.

Pradeep C



Angela Reichstein posted this 18 October 2018

I have the same problem. I've also downloaded the drivers. The promise utility just doesn't seem to register that the R4 is connected at all.

Interestingly it works fine when connected to my macbook air running the same verson of macOS just not to the iMac.