This article provides instructions to prevent random ejection of some LaCie external drives on macOS Catalina 10.15.5.
Some users have reported issues with LaCie drives randomly ejecting themselves after updating to macOS 10.15.5. Most reports indicate that the issue is seen after the computer has gone to sleep. See the prompt below:
The two most commonly reported drives are:
LaCie has released a firmware package for d2 Professional that fixes the random ejection. Please proceed with the instructions below to update the firmware of your d2 Pro:
Note: If the updater reports no device to update, please safely eject the volume, unplug the cable from the computer then plug it back.
IMPORTANT!: This firmware update pertains to the d2 Professional only, a firmware package for the 2big RAID still under development. If you have experienced random ejection with your 2big RAID, please proceed with the workarounds listed below.
If your LaCie External Drive was working fine before upgrading your macOS, and now it ejects randomly, this is an indication that the issue may be related to the update or the update process.
LaCie is working with Apple to understand and resolve any possible issues, but in the meantime, we have a few workarounds that will avoid unexpected ejections. See the steps below:
Note: The following steps can only be accomplished by admin users.
Check the current pmset
Change the pmset to its highest value
Check if pmset was changed
Should you need any assistance using Terminal, please reach out to LaCie support here. There are also some other power options worth trying below:
Note: The workaround will not work if the Mac is operating on battery. The power supply must remain connected and the computer lid must remain open.
Note: Your drive may still eject if you manually put your Mac to sleep even after changing these settings. There is no workaround for this currently, other than to avoid putting your Mac to sleep altogether or safely ejecting your drive before you put the Mac to sleep.
If you have a different external drive that was not listed in this article or if these steps do not solve the issue, please visit this article.
Final note: If nothing else works, going back to MacOS 10.15.4 will resolve the issue until a permanent fix is resolved in 10.15+