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I experienced the same thing with a thunderbolt external 5 HDD bay enclosure when I upgraded my 2018 Macmini 8,1 to a 2023 16" M2 Max MBPro 14,6. Not 100% sure if the problem started when I went from the Intel chip to the M2, or when I upgraded my MacOS from Ventura to Sonoma because both happened simultaneously. I just know that it worked before on the old system. The symptoms were... regardless if the thunderbolt cable was plugged directly into the MBPro or external dock, the drives would continually drop after 3ish hours. Only solution would be to reboot the system and start the 3ish hour window again.

*Knock on wood* I have been symptom free for the past week. I have connected my thunderbolt cable into my dock using a USBC female to USBA male adapter. Of course, the usual suggestions of "Prevent automatic sleeping... [On]", "Put hard drives to sleep... [Never]", "Wake for network access...[Never]" have been applied. I purposely have kept my system running 24/7 the past week to try to get it to fail, but as of now I am good to go.

This solution may not be for everyone. An individual I work with has exactly the same 5 bay setup... but with a 2023 M2 MBAir, and the drives drop even with an adapter or USBC to USBA cable. He is now looking at other culprits, like OneDrive, that seems to be hammering his system constantly.
 
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Install the Amphetamine app and enable 'drive alive'.
On/off cycling is probably the worst thing you can do to hdd's.
When you need access to it on a daily basis, it's preferred you keep them spinning at all times. The energy you save/environmental impact would be nihil compared to having to replace the drive and lose the data.
 
I've noticed the HDD's spin even if my Mac Mini is powered down, just as long as the drive is plugged in. It really bugs me now that I've noticed. SSD will have to be the way to go.
 
Has anyone tried running a drive through a Thunderbolt hub versus connecting over USB 3?

This post from Nov. 2023 would suggest Thunderbolt has the same issue, but has anyone tried switching connection methods?

I'd imagine going NAS would solve the issue.

I experienced the same thing with a thunderbolt external 5 HDD bay enclosure when I upgraded my 2018 Macmini 8,1 to a 2023 16" M2 Max MBPro 14,6.
 
I'd imagine going NAS would solve the issue.

Yes, pretty much. If you also run the NAS on a 10 Gbe network, the speed will be more than enough (providing you will get a multi-bay for added read/write performance)

I got so fed up on this and I purchased a NAS. The switch was like a breath of fresh air. It also brought me some other benefits like running services, backups etc on a schedule without my Mac being on.
 
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I just want to chime in on this also. I've been dealing with this issue also. All my external drives have this behavior and its driving me bonkers. I'm a video editor and when editing on FCPX it would be fine. The moment say I go into a browser reading something for less than 10 seconds the drive goes to sleep and takes time for the drive to spin back up

  • I've disabled 'Put Hard Disks to sleep whenever possible'
  • Used terminal commands to disable drive sleep | sudo pmset -a disksleep 0
  • Used the Mac App Amphetamine and used their feature Drive-Alive which writes to the drive every 10 seconds or whatever time you put and that doesn't work
  • Used different USB-C cables, 2 different thunderbolt 3 hubs (anker 13-in-1 and elgato's) and same result
I'm leaning to more this is a bug or something in Monteray. Here are my system specs

14" M1 Max 24c GPU, 32gb ram, 1tb Storage
macOS Monterray 12.1
It seems like the conversation stopped a couple of years ago, but has anyone ever found a solution for this strange behaviour?
 
It seems like the conversation stopped a couple of years ago, but has anyone ever found a solution for this strange behaviour?
Mine just stay spinning, no matter what I do. So I guess my issue is a little different. I've even upgraded minis since this issue began, and still the same behavior no matter what settings I mess with.
 
It seems like the conversation stopped a couple of years ago, but has anyone ever found a solution for this strange behaviour?
No, and Apple is ignoring the issue as hard as possible even though i gave detailed reports about it via Feedback Apps and Bugreports over their website.
 
My 2019 iMac i9 stopped sleeping altogether with 14.5, I had to manually put it to sleep. BTStack and Handoff appeared to be the culprits.

Autosleep seems to be working again with 14.6.1, but I don't expect the HD issue to be fixed after all these years.
 
a longstanding bug got fixed in iOS18... this raises some hope for macOS. Anyone tried Sequoia regarding the HD-spinup/down issues?
 
Not yet but I plan to soon. But given this issue has persisted through several major updates I'm not holding out hope. 😕
 
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