Mac Studio and External Drive

I have the new Mac Studio, released yesterday. I have an external hard drive connected by cable for Time Machine backups.


Everything works fine until the Studio SSD goes to sleep when not in use. Then, when Studio wakes up again, a message is displayed saying the the "external drive name" wasn't ejected properly. The drive is not shown on the desktop but after a few seconds it reappears. Of course the external drive was never ejected - simply the Studio drive stopped seeing it when it went into sleep mode. I am confident in saying this didn't happen with my old iMac.


A chat with Apple Support this evening suggested preventing the hard drive from going to sleep, but that seems like a poor workaround which isn't good for Apple's green credentials or my wallet.


I suspect this is an OS bug but wonder if anyone has any other thoughts?


Mac Studio, macOS 12.3

Posted on Mar 19, 2022 2:20 PM

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Posted on Mar 19, 2022 2:53 PM

This has been an increasing problem with some Bus Powered drives that do not react gracefully to the Mac dropping power during sleep.


Doing this helps Apple meet their Energy-Star requirements, so I do not expect this to change.


If it is a problem for you, you can use a different drive that tolerates power drops more gracefully, or provide an external power supply to the drive you have.

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45 replies

May 6, 2022 11:13 AM in response to Brightone2

@Grant Bennet-Alder The drives I am using are LaCie 5TB mobile drives which can be bought on the Apple Store. The thing is, there have actually been scenarios where the sleep/wake cycle does work as expected, so I'm not sure whether the theory above holds up. I have also been testing with my LaCie Big2 drive which has its own power supply and I get the same behaviour, that Mac Studio doesn't want to keep the drive awake.

May 21, 2022 11:58 AM in response to Brightone2

I have a similar problem but different. I have two Sonnet Echo Dual NVMe docs / Thunderbolt. No weirdness with 'spinning down' of course, but when I put it to sleep the Echo Duals will go to sleep (lights out) and at some point light up again - but nothing 'wakes up' - they are just in a state of readiness I guess. They are using juice because they get somewhat warm to the touch - as does Mac Studio Ultra 128/2TB.

I have automatic sleep disabled ('never sleep') as I'm using this in a recording studio.

Jul 27, 2022 8:06 AM in response to Brightone2

Thanks for all the comments. I have a similar though less sophisticated concern. I am contemplating replacing my 2012 iMac 27 and splurging for the Mac Studio for lack of a less expensive intermediate option. Seeing how much storage costs, I am trying to figure out how to configure my system. Would folks suggest 1 tb ssd storage system with an external drive to hold what I currently have? 1.08 Tb in Documents, 450 Gb in Photos, 65 gB in music, etc... ? What drives would folks recommend? Thunderbolt 3 or USB-C connections? Will that keep performance good? allow for backups and access with the system or will I have a lot of spinning wheels as drives ramp up like you all are describing?

Thanks and sorry to bring the level of discourse down a notch :).

Jul 27, 2022 8:53 AM in response to aschuss

My personal opinion is that an external Thunderbolt 3 NVMe M.2 SSD (dedicated cabinet) would be perfect for daily work, very fast solution. In any case you have to consider a more reliable device as backup;, mechanical HD is still the best and sicure choice to archive your files. Ssd devices are fast but not reliable as backup unit.

I have a little Nas for Time Machine backup.


Jul 27, 2022 10:26 AM in response to Rikki_62

"Lil Nas"? Isn't that a country hip hop artist?

When I'm hoping to do is make one of my old cheesgraters into a server for backup. Doesn't seem Mac Studio is real keen on spinners.

Also, from what I'm hearing, a lot of folks are ordering bigger drives in their Mac Studios. The drives and the machine are so fast you can run Pro Tools sessions - big ones - from the internal drive. While you might not be running Pro Tools, it tells me the internal drive can handle a lot of abuse (lots of data all at once) the old main HD spinners couldn't.

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Mac Studio and External Drive

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