Pegasus 2 R6 not seen after update to macOS 10.12.4 (16E195)

  • Last Post 30 March 2017
Adam Bridge posted this 30 March 2017

Since updating to 10.12.4 on my 2013 MacPro I can no longer see my Promise Pegasus R6 drive. The Thunderbolt light on the front of the unit is ON. Before the update this system worked perfectly.

How to proceed?


From the System Report 


  Vendor Name: Promise Technology, Inc.

  Device Name: Pegasus2-R

  Vendor ID: 0x2

  Device ID: 0x9

  Device Revision: 0x3

  UID: 0x0002000000114040

  Route String: 1

  Firmware Version: 19.2

  Port (Upstream):

  Status: Device connected

  Link Status: 0x2

  Speed: Up to 20 Gb/s x1

  Current Link Width: 0x2

  Cable Firmware Version: 1.1.0


  Link Controller Firmware Version: 0.13.0

Devendra Kumar posted this 30 March 2017

Hi Adam,

It looks like this issue needs to be analyzed with the help of subsystem report of the unit to find out the exact issue. Please call technical support at 408-228-1500 or reach out through support case at and attach the subsystem report to the case for further investigation.