"Disk Not Ejected Properly" error after EL Capitan goes to sleep and wakes up again.

That's disappointing. I think I'm up to at least a dozen sleeps and my G-Drive is performing great with the USB 3.0 hub. I haven't had one issue with it waking or disconnecting. Do you think a restart AFTER you unchecked "Put hard disks to sleep when possible" would help? What about a PRAM or SMC reset?

Kelly,

FWIW, I have 2 different GTechnology GDrives connected to my 4 week old iMac Retina 5k, one is a 4 Terabyte and the other is a 6 terabyte, both are also only 4 weeks old. Both are connected via USB 3.0 into an unpowered hub, which is then connected to the back of my iMac.

From day one, neither GTechnology drive has had an ejection problem. Both work perfectly, sleep perfectly, wake up perfectly.

My problem is my (also brand new) 6T LaCie RAID drive connected via thunderbolt. That one is unmounted with an error message every time I sleep the iMac and wake it up again. I have tried changing every Energy Saver setting combination I can and every time, I get an error message about the thunderbolt drive upon waking from sleep. The drive disappears from the system profiler and will not reconnect unless I physically unplug and replug the thunderbolt cable.

Even with all the changing of settings in energy saver, the GDrives continue to sleep and wake correctly. Never an issue.

The only odd thing about the GDrives is that one of them is shown in System profiler as an INTERNAL drive on my iMac and one is shown as an EXTERNAL drive. Both are connected to the same hub via USB 3.0. Not sure about that one.

Hi Jim.

Yes, I saw your post earlier, but I must have missed the fact that your G-Drives were connected to a USB 3.0 hub. All of my problems occurred when my G-Drive was connected directly to my MBP. Once I connected it to the powered HUB, all of my problems went away, which is good because it was driving me MAD. Plus, I can't imagine what kind of file damage is being done every time the drive disconnects abruptly.

I'm assuming your LaCie RAID is connected directly to your iMac. If so, that seems to reinforce the theory that there is some kind of a signal that's being cut-off to all directly connected external drives, but it doesn't explain myaka's problem. This is all very strange.

Where is an Apple tech when you need one?

I had trouble for a few days, but was finally able to submit a bug report to Apple. Who knows if it will get read, but this thread keeps floating to the top whenever someone posts... so that might help.

Yes, my Thunderbolt drive is connected directly to the iMac. I have not tried connecting the GDrives directly and I really don't want to mess with them because they have been flawless since I started using them. My USB 3.0 hub is unpowered. It is a cheap Sabrent 4-port hub.

When I spoke to the LaCie tech, she suggested it was a thunderbolt PORT issue. When I plugged the LaCie drive into an old Snow Leopard MacBook Pro via USB 2.0, it worked perfectly with sleeping, waking, shutting down, everything. It remounted no problem. When I put it back into the iMac thunderbolt port, the error/unmounting happened again.

Jim, this is Interesting.

Under System Profiler, one of my two mounted dock drives shows up under the USB heading (the other does not!) and is listed as Detachable. Under the Storage heading, both show and both are listed as Internal.

It is also strange that you and Kelly have drive enclosures from the same manufacturer but different experiences with them. I have USB 3.0 enclosures from two different manufacturers, Sans Digital and Xiaboi, but only have issues with the latter.

Glad you managed a bug report. I have also submitted a bug report that referencee this discussion.

Myaka,

I just looked at my system profiler again. I have two USB 3.0 GDrives from the same manufacturer with the same enclosure bought 4 weeks ago from the same store, but one is 4 Terabyte and one is 6 Terabyte. Both are connected to a USB 3.0 hub. The hub is plugged into the back of a brand new iMac.

In System Profiler, under USB tab, one is listed as a USB 2.0 drive and one is listed as a USB 3.0 drive.

Under the Storage tab, the 4Terabyte is listed as an INTERNAL drive, the 6Terabyte is listed as an EXTERNAL drive.

Well, my GTechnology GDrive flawless streak has ENDED. In an effort to try one more thing to stop my thunderbolt drive problems, I decided to try to reset the NVRAm one more time.

I ejected and unplugged all external drives, shut down the iMac, reset the NVRAM and then plugged all the drives back in as they were and started them up again. Within 5 minutes both G-Drives unmounted themselves and then remounted themselves, both with the "Disk not ejected properly" error message. One happened while performing a backup task. It just disappeared and then came back. The backup task stopped and I tried it again and it worked the second time. The other GDrive did the same thing while the first one was completing it's backup second attempt.

I am very worried now. I had not had a drive eject WHILE it was in use yet. And I had not had one of these GDrives eject in 4 weeks. Now it seems like all drives are fair game. All three 4-week-old drives have been affected. Dammit.

Please help, Apple.

Okay, now I'm totally confused. I just checked my setup with Apple System Profiler and it's reporting that my G-Drive is connected to a USB 2.0 Bus, but here's the problem. My Mid 2012 MBP i7 ONLY has USB 3.0 ports and my Satechi Hub only has USB 3.0 ports as well. What the heck is going on?

**** Jim. I'm sorry to hear that.

[UPDATE]

I just discovered that you can't swear on the Apple Forums. If your curious, the four letter word I used is the thing that holds water back.

Yes, What the heck is going on???

All of these drives, my hub and iMac were all purchased a month ago. It's all the fastest I could buy. USB 3.0, Thunderbolt 2, 7200RPM drives... A Late 2015 Retina 5K iMac... Why is the system profiler even bringing USB 2.0 into the equation? What is up Apple?

When I replied to Myaka earlier, one drive was at the top of this tree in the "USB 3.0 Bus" section and the other was under the USB 2.0 hub listing. After a sleep/wake cycle, they now both register in a USB2.0 hub. So bizarre.

I'll call G-Technology tech support tomorrow and see if they know anything. There's a genius there named Louie, who is incredibly well versed in this stuff.

I'm curious, Jim and Kelly,

What does this Mac Specs site show for your models?

http://www.everymac.com/

Does it rule out that the model does not / should not have usb 2.0 port?

Here's another screen shot that shows the chain better (see the bottom). Linda, everymac.com reports that my MacBook Pro ONLY has USB 3.0 ports, so I have no idea why the OS is reporting a USB 2.0 Bus. I can understand USB 2.0 devices, but not a USB 3.0 Bus. http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.3- 15-mid-2012-unibody-usb3-specs.html

Linda, I have a

Apple iMac "Core i5" 3.2 27-Inch (5K, Late 2015)

It should have Four USB 3.0 ports. No mention of USB 2.0 anywhere.

Kelly,

Look under the "Storage" Tab. One of my G-Drives is listed as "Internal : Yes" in the bottom right pane while the other one is listed as "Internal : No"

Both are external, plugged into the same hub. Is yours listed internal or external?

This is all so strange.