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Disk Not Ejected Properly macOS Sierra

I upgraded to MacOS Sierra a couple of days ago and ever since, whenever my MacBook Pro (Mid 2015) goes to sleep my external hard drives (all but Time Machine) are disconnected. Upon waking the computer I get the "Disk Not Ejected Properly" alert. I was not having this issue prior to updating to the new OS. I've tried restarting the computer and experienced the issue again. Please help!

All of the drives are running through a hub - which has never given me issues until the Sierra update. The two drives disconnecting are portable drives (1 Western Digital, 1 Seagate). My time machine (which isn't disconnecting, also a Seagate) is a powered, desktop drive.

Any help would be appreciated. Thanks!

Exact same problem here with early 2015 13" MacBook Pro.

An SMC Reset has been known to fix that: Reset the System Management Controller (SMC) on your Mac - Apple Support. Try a different USB port also.

Thanks for the quick reply and link John - I will give that a try .  Having the issue on the thunderbolt 2 port. 

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.

Having the same issue on my older Mac Pro with a USB 3 card I'm using. Tried a script from another site to help with the problem. Any workarounds?

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.

With me and my WD drive, it's every time the Mac goes to sleep. I've searched around the web and really found nothing promising for a solution except for a script I found on a trusted site, but that didn't work.

My 3 internal drives are fine.

Just one partition on that drive and I only use it for Time Machine.
As for now, I just ignore the error messages. It's probably the best we can do.

Have you done the fsck command already?

If you have installed any WD software, uninstall it. Then

SystemPreferences->Bluetooth->Advanced: uncheck all, especially the third one.

Important:  SystemPreferences->EnergySaver->PowerAdapter: uncheck "wake for network access".

最后更新：2017-09-02 05:30:23

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