Enabling TRIM causes USB external drives to eject improperly on sleep?

[JoeTheZombie]

I have an older Samsung SSD drive, so I purchased this StarTech USB/SATA adapter cable so I could use the drive externally on my late 2013 iMac. I then enabled TRIM using the terminal:

sudo trimforce enable

This worked, and the drive works well. But as a side effect, it has caused itself, as well as my Seagate Backup Plus Desktop Drive (4TB) to spontaneously eject whenever the computer sleeps. I then get the warnings in notification center that the drives have not been ejected properly.

I turned off TRIM using the terminal:

sudo trimforce disable

And just as I thought, I no longer have problems with drive ejection during sleep. Anyone else seeing this? Any workaround?

 

[Weaselboy]

This does not fix your problem, but TRIM does not work over USB, so there is no point in trying to enable it.

 

[JoeTheZombie]

Ah, thank you. I will keep it disabled then and avoid the issue.