macOS : Possible workaround for `Disk Not Ejected` error

Posted on in macOS

See this thread titled :

Disk Not Ejected Properly – AGAIN AGAIN AGAIN AND AGAIN…

I have started seeing this problem a LOT

TL;DR: Something breaks when macOS goes to sleep

Solution : Do not allow macOS to sleep when using external disk.

I have had to resort to using an application called Amphetamine (earlier Caffeine) and set the ‘Drive Alive’ mode to prevent sleep. All the problems went away. It has nothing to do with ‘frayed cables’ or ‘drives going bad’.

Based on above, I’ve installed the app, and trying it 🤞 1

Other suggestions also suggest turning off screen saver (or other ways to prevent macOS from sleeping)

  1. It helped to some extent. But not fully. As I mentioned I used rsync to copy files, and noticed that I would get this error while the copy (rsync) was in progress. so it maybe more than macOS going to sleep. ↩︎