DISK NOT EJECTED PROPERLY keeps popping up Big Sur 11.3.1

I've had this start happening on my wife's Air after upgrading to Monterey. It doesn't happen on my Pro, just hers. Same external.

Same here. Two Identical Mac Mini, with the same OS, Monterey 12.5.1 In Mac #1 everything is working perfectly, in Mac #2 the same disk eject continuously overnight. Every energy saving, etc is deactivated, I also tried Caffeine and Amphetamine, nothing at all.

When two identical situation lead to different results, it probably means there is some random cause that move something over a threshold. Indeed, looking in Apple -> Information on this Mac -> Hardware -> Usb -> Bus Usb 3.1, the disk Extreme SSD need 896mA of current, while the maximum available amount is 900 mA.

This means that with 2% of tolerance in current, it is perfectly OK that sometimes the current goes above or below the threshold required. This also explain why Apple doesn't fix the problem: it is a hardware one, no enough current available, and thus impossible to solve. In addition, Apple can't admit this because you can't spend 3000$ and have a computer with low hardware specs.

I am going to change SSD disk, and see if it works. Another option could be to change the USB-C to USB-A, hoping that in that case there is enough current to keep the disk powered on.

My 2 Cents.

Same here,

Latest MacBook Pro, updated to latest version, ...etc.

my new Sandisk SSD keeps disconnecting, not able to copy/paste.

Tried many cables, many formats, nothing worked.

And it's working fine on WINDOWS! with copy/paste speed at 1GB/s! Apple really screwed things here by some unknown issue, and no reply at any kind!

In the hopes of a fix for this, I updated to OS Ventura 13.0 from Monterey 12.6. It is now worse than before! I did get my externsl 4TB Seagate Backup Plus to transfer almost 2GB to my hard drive without issue. I thought the OS update worked.....only to return an hour later to see at least 50 "disk not ejected properly" messages. I then conneced the external Seagate Backup Plus to an old iMac, running High Sierra 10.13.6......no eject problems at all! Come on Apple! I have a business to run, and I can't do it without external drives!

I had the same issue by using a Blueendless HD501 usb hub. Recently I bought a Myria MY8062 hub with almost the same specs. With this new hub I had no issues. I suspect that in my case the problem was the communication between the old hub and the Mac mini M1 (I doubt that the new one uses less power, so the power used might not be an issue). The old usb hub works fine on a Windows notebook, so it's not faulty.

Blueendless hub requires 5v 2.4A, I don't have the power rating for the new one. Both hubs are connected via usb-c, have 1 hdmi, 1 card reader and some usb ports

Same problem here also: G-Speed Studio XL disconnecting while computer is asleep. Happened rarely before but with latest update, I'm getting 10+ messages each time I log back into computer if I've been away for more than 4 hours. If gone just 2 hours, I've got 5-6 messages. It's ridiculous.
Curiously, I also have a G-RAID drive that never disconnects.
Both drives are Mac OS Extended Journaled.

When I try to eject the Studio XL, it's cannot eject and must be forced.

Exact same problems here on Ventura 13.0.1 with a Lacie 2big Dock.

Here also a similar issue and easy reproducible.

I am using an M1 Mac Mini with an external Samsung 980 Pro 2TB NVMe in a USB-C enclosure (https://www.amazon.com/Hagibis-Enclosure-MC25-Pro-DP/dp/B096LMGTNG). Copying files larger than 20 GB will cause the disk to eject. Just now wanted to create a backup from SD-card to this external HDD, the backup worked until the image reached the size of 21,06 GB (21.048.066.560 bytes). This is really frustrating, as I bought for 400 euros worth of hardware and can't even use it in a normal way.

I tried several connection options and found that connecting the enclosure using a USB-C to USB-A (USB 2.0) cable resolves this issue of copying large files. But the overall speed is extremely slow in comparison.

Hope this can be resolved eventually in the OS software and it is not hardware related.

Hi there,

You might have better luck asking this question over in Apple Support Communities run by Apple Support.

I'm having this same problem. I just purchased a 2TD SanDisk SSD and it constantly ejects itself every few hours. When I log back in in the morning I have a stream of DISK NOT EJECTED PROPERLY notifications. I have 2 older 1T SSDs of the same type + brand that have been running fine for the past 2 years.

With so many people having the same or similar problem why is Apple not attending to a fix? Surely it's a simple enough issue, but we users are left with the problem unresolved.