Disk Not Ejected Properly macOS Sierra

Having the same problem with an OWC USB-C powered hub.

This post is off-topic and unhelpful. Please take your rant somewhere else.😠

The Spotlight workaround finally worked for me now that I just moved to High Sierra.

Spoke too soon. The Spotlight workaround of preventing it to access the offending external hard drive didn't work.

after 25 years of using Apple I can only concoure Apple has become the new Windows ... no QA anymore and usuabilityis and reliability is going down the drain

Agreed

unfortunately this did not solve it i had 3 days no ejection but this morning after waking up again 2 HD force ejected

AMEN!

I tried it - and nothing.

I'm having the same problem on an iMac 5K -- started after the macOS Sierra upgrade and the hard drives are connected via Thunderbolt. Resetting the SMC did not resolve the problem. Simply shutting down and rebooting seemed to help once but only very temporarily.

Has anyone found a solution yet? This has been happening to most of my external drives. Two separate Thunderbolt enclosures, a USB3 enclosure and a USB2 SD card reader.

SMC reset did not work. PRAM reset did not work. Restart did not work. Repairing permissions did not work.

Anyone?

Make sure that the hub is powered and connected to the power ! Without its own power to the hub the mac USB power will decrease when the mac goes to sleep and thus the disks disconnected.

Also in SystemPreferences->EnergySaver uncheck "put the hard disks to sleep when possible" in battery and power position.

I have a 2015 Retina Imac and up until OS Sierra 10.12.3 I had a Seagate on Time Machine and Western Digital My Book Studio doing Chronosync backups. both have own power, always on, always mounted without any bother at all for at least a year. I only shut the iMac down once a week.

after OS 10.12.3

The Seagate is still no problem but the WD either ejects improperly or more likely doesn't mount properly.

I have taken to unmounting it after every use though even that isn't always good enough.

Sometimes when I mount it there are no folders showing in finder, sometimes there are folders but no contents. and sometimes it's fine! and that's after all the suggested fixes.

The WD is a two day old replacement for my original and has passed all the drive tests.

If I do restart it's fine until it sleeps overnight.

I wonder if Apple knows there are issues

It can be the disk also.

Connect, start DiskUtility, select the WD disk, run FirstAid; then select the partition on the WD disk, run FirstAid.

If that does not do it, run Terminal command fsck on the WD disk.

I'd be surprised. Thought given my experience perhaps I should be.

it's my third RMA replacement for the original. The other two failed the long drive test out of the box And went straight back. This one passed.

I have put two partitions and data on it and have run all the tests/ first aid again and it comes up fine every time.

what I find is that if a volume is not ejected properly comes up, the entire drive disappears, has to be powered down and reconnected. or restart the Mac.

the improper ejection seems to only if the volume is not properly mounted where some of the data just isn't showing up.

I'm sure the issue is with Mac in this case.