M1 MacBook Pro "Disk Not Ejected Properly" several times during sleep

Sure.

You can choose to boot from any internal or external disk which has MacOS on it. This is where you select your boot disk: System Preferences > Startup Disk.

Below is a tutorial for installing the MacOS version of your choice, on the disk of your choice.

Hope this helps.

https://www.macworld.co.uk/how-to/macos-external-drive-3659666/

I'm hoping that before too long SuperDuper and/or Carbon Copy Cloner will be able to make bootable clones for computers with the M1 chips. (I've always had cloned backups of my hard drives and won't feel REALLY relaxed until I'm able to do it with this one as well.) But if the problem still persists when that day comes, I'll give it a try - any reductions in response time wouldn't be a deal breaker for me in the way I use my computers.

Thanks

This thread is about M1 machines. Every M1 machine can run Big Sur.

> Not everyone's external hard drive is bootable

False. Every external HD supported by Big Sur is bootable.

> it's very inconvenient to boot

False. It's unsupervised. Just select your boot disk: System Preferences > Startup Disk

This forum is for problem-solving. If you have the expertise to make useful suggestions, please make them. Otherwise, you're not adding value.

Bottom line: your solution isn't even a good workaround. Furthermore, it's almost ridiculously simplistic: "if I boot from my external USB drive, it won't disconnect." Bravo! You've really made a great discovery there! Now what if I have several external drives? Should I reboot from each one in order to use them?

If one hasn't installed a system on one's external drive, you can't boot from it. It's inconvenient (to say the least) to install a whole system on an external hard disk simply in order to avoid disconnection. Furthermore, it's well known that M1 Macs have problems booting from external drives.

> your solution isn't even a good workaround

It's an excellent workaround for anyone with an M1 machine with a relatively low-capacity internal SSD, and a single high-capacity TB3 SSD. Given the currently-available prices and configurations of M1 machines, that's likely many people.

> it's almost ridiculously simplistic: "if I boot from my external USB drive, it won't disconnect." Bravo!

No. There are many possible causes of this issue, which could have prevented a boot. It's silly to assume that one could boot reliably from a disk, which is throwing errors, until you try it. I tried it, and I'm reporting the results. The results eliminate some possible roots causes, and also provide a useful workaround for some folks.

> Now what if I have several external drives?

You can work on that one. I've suggested a useful workaround for the single-drive case.

> It's inconvenient (to say the least) to install a whole system on an external hard disk

It depends on your skill level. I posted step-by-step instructions above. You can decide how inconvenient it is for you. You can also decide which is more inconvenient: installing a system on your SSD, or using it as a doorstop (which is the question which really matters).

> it's well known that M1 Macs have problems booting from external drives.

I reported my results above: My M1 Mac has been booting off my external TB3 VisionTekSSD for about 2 months with no problem. The measured r/w speed is about 10% better than the internal SSD.

I think we're done, have a nice day!

I thought it had gone away with the last update, but now it seems to have returned with a vengeance.

I've just now unchecked Put hard disks to sleep when possible under Energy Saver and see if that helps.

I am fed up with this problem. Since upgrading to Big Sur I receive multiple "DISK NOT EJECTED PROPERLY" notifications through the day and especially when the computer is idle. I have definitely noticed that the last few years of MacOS upgrades have made maintaining a stable connection to an external HDD almost impossible. Big Sur is the worst yet.

And starting my day having to dismiss 20 Eject notifications does not make for a great Mac experience.

Just to share my situation and setup.

I have a 5TB 2.5" WD external disk to my macbook air (2020 m1) thunderbolt port.

Basically I keep a backup of my pictures/videos on it.

Every time I leave the computer unattended and wake it up, I have the message saying that the disk was not ejected properly.

I am not using any hubs or nothing that would add complexity to the setup.

Big sur is simply shutting down the disk before the OS, and not even properly.

I could try the option to not to put the disks to sleep, but honestly I want the disks to rest while not in use, since this is a HDD and ideally I don't want it to be spinning 24x7

C'mon apple, you could at least admit there is a problem here?

This whole eject-gate thing is getting ridiculous. Today I didn't even have my external plugged in and when I opened my MacBook I got ten Eject Errors. Apple PLEASE do something:

• At least let us turn off eject notifications.
• AND dismiss multiple notifications at once and not one at a time.

I don't understand why you folks are reporting these issues here if you're not reporting them at the same time to Apple Support. They won't get fixed by reporting them here, and many similar reports would help make the problem appear important to Apple.

MBP13 M1 Dec20 I have the same issue with disks being ejected even whilst i'm working on them. I was using a Satechi hub with the two plugs slimline thing, and with a Samsung T5, power cable and a SD card it would keep dumping the T5 unsafely. I sent the hub back and the new one did the same. SO i haven't bought another hub since.

Today I've been using the MBP again as a side computer exporting jobs from lightroom, with the T5 and a QNAP TS453BT3 Nas direct attached with TB3, and now that is being dumped. I seriously hate this machine it's been nothing but dramas since I purchased - it won't even tether to a 5dmkiv ffs. So yes I'm still using my old MBP2013 with mojave. pathetic.

Anyways, I'm working with support now so will let you know if the issue is resolved

duplicate

Well, I restarted and the problem hasn't resurfaced yet. You're using the CalDigit dock instead of the OWC?

I have the same problem. Any solutions you may have pls . I am not a computer wiz, so can somebody detail the steps i can try pls

I have an MBP 16" 2019 running Big Sur 11.1 and I get this Disk Not Ejected Properly waking from sleep. I have TB3 hubs from Pluggable ™. Will investigate with the hubs and come back