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OSX unnecessarily wakes external drive - can this be changed?

I have a Seagate FreeAgentPro (FW4 Media) connected for Time Machine and extra storage purposes which is often asleep. Every time I save anything within any app OSX seeks to check the external drive – causing a spinning beachball delay until the drive is up and running – even if, as is usually the case, I intend to save to the internal disc. It's very annoying. (Why can't they make it so that if you choose the external disc as a destination, only then do you have to wait for it to be wakened?)

Now with Snow Leopard every time I choose Look Up In Dictionary from within Safari, Pages, and some other apps (not Text Edit) it does the same thing and waits until the external drive is up and awake again before it opens the Dictionary. Grrr.

I'm wondering if OSX's behaviour can be changed so that it no longer needs to wake up my external drive when I hit Save, or Look Up In Dictionary. Or is this something to do with the drive, and other people don't experience this behaviour?

MacBook (white) 2.16Ghz, 3Gb RAM, 500Gb HD, Mac OS X (10.6.2)

Posted on Jan 26, 2010 1:37 PM

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118 replies

Oct 20, 2013 7:53 AM in response to CRhysB

Just to make sure Apple continues to see the widespread effect, and how there's no shortage of people annoyed at this, I'm tossing my hat into the ring. Same problem, external WD 2TB USB drive wakes up every so often and freezes the entire OS for a handful of seconds.


I'm one of those keyboard people, and while developing software I can get on a roll, flying through windows, menus, and other typing. This really knocks the wind out of the momentum. Apple, please fix this.


Message was edited by: Vurcease to fix ridiculous spelling mistakes.

Oct 24, 2013 7:49 PM in response to Niklas Luhmann

I was sitting at my desk and noticed that all my external drivers were asleep.

  1. I launched preview and all the external drives remained asleep.
  2. I did file->open and all external drives remained asleep (the directory visible in the open dialog was on my internal/system drive).
  3. I selected one of the external drives in the devices section of side bar in the open dialog and that drive spun up (only the drive I selected).
  4. I selected my computer (also under the devices section in the side-bar) and all the drives spun up.

I would say that overall this is fixed. The system is much snappier all around!

Oct 24, 2013 8:35 PM in response to CRhysB

Ok looks like this might be fixed in Mavricks. It's also a function of the drive and not the OS so apple can't really do anything about this. Get rid of offending drives and try different brand, mac specific brand perhaps. My 3Tb segates USB behaved badly in ML but in Mavericks they now appear to be aways when I need them to be so perhaps Apple is on this.

Oct 26, 2013 8:35 AM in response to richpjr

richpjr you need to dump that drive and get a new one. The power saving features are a function of the drive hardware / enclousure too so unless you run the computer 24/7 without sleeping it you will probably always have this problem. You might even have to resort to buying them from the apple store but at least you can take them back and get a refund if they don't work. Avoid any "green" drives, my samsung drives had this problem and I had to eventually get rid of them due to this.


There may be a utiity to keep the drives spinning but none I know of.

OSX unnecessarily wakes external drive - can this be changed?

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