My External hard drives disconnect randomly or when I sleep/wake my Mac causing an improper drive eject error message.

Last Update: July 22nd, 2022
Article ID: 1355913

Hard Drive Updates:

  1. Check for and update external hard drive firmware if available.
  2. For Intel based Macs, perform an SMC and PRAM/NVRAM reset SMC.:
    • Perform an SMC reset:  
    • Perform an NVRAM/PRAM reset: 
  3. Disable Power Nap on Mac (in power settings, disable for when connected to AC power and battery if the customer uses the hub while also on battery power).
  4. If possible, test the USB hub and hard drives with a Windows PC to see if the issue persists there as well.

If this issue persists, if possible we have a tool that automates collecting a set of log files from your system. You can download the PlugDebug tool and learn how to use it by clicking on this link:

Ensure that you have the USB Hub connected to the computer when the PlugDebug application is run. Then send us a copy of the log files to