Audio interface problems with Fusion drive

Discussion in 'iMac' started by tenayo, Jan 20, 2014.

  1. tenayo macrumors newbie

    Jan 20, 2014

    I am on my second audio interface and it has the same problem as the first one. I wonder if the Fusion drive in my iMac is the culprit. I am using Logic Pro X.
    The Presonus 44vsl (and focusrite scarlett 2i4 before that) work ok for the first few minutes and then it's all crackle, distortion and really bad latency. Does anybody know if there is going to be an update to fix this? Is it possible to change the drive on my iMac?

  2. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    Are you running Mavericks? Is the audio device a USB device? Reportedly this is fixed in 10.9.2 which should be available within a few weeks.
  3. tenayo thread starter macrumors newbie

    Jan 20, 2014
    Yes Im running Mavericks and my device is USB.
    Have you heard anything regarding the Fusion drive?

  4. Fishrrman macrumors G3

    Feb 20, 2009
    [[ Yes Im running Mavericks and my device is USB.
    Have you heard anything regarding the Fusion drive? ]]

    This is a well-known problem. It's been documented elsewhere in this forum (you realize that there is a separate area on for "digital audio"?), and elsewhere, such as at

    Macs with Fusion drives running Mavericks don't work well with audio apps and interfaces, as you have discovered.

    There is speculation that the upcoming 10.9.2 update will fix this. But that's really unknown until the update is released and enough folks have it installed to ascertain if it will correct the audio problems.

    You might try hunting down the developer release of 10.9.2 and installing it (it _can_ be found if you dig for it).

    Another solution, pretty much guaranteed to work:
    SPLIT the fusion drive into separate SSD and HDD drives. The terminal commands to do this can be found on the net. You MUST back up first to an external drive, as "breaking fusion" will destroy all the data on the two drives. But folks who have done this reported that it will fix the problems....
  5. tenayo thread starter macrumors newbie

    Jan 20, 2014
    Thanks Fishrman,
    Is the splitting of the FD reversible?
  6. Fishrrman macrumors G3

    Feb 20, 2009
    [[ Is the splitting of the FD reversible? ]]

    Yes, you can "re-fuse" the two drives when an OS update deals with the problem.

    However -- again, you must completely back up BOTH drives to an external source.
    And you'll have to manually "merge them together" once you have re-created fusion.

    Actually, for audio production, you might find it preferable to maintain TWO individual drives -- one to house the OS and apps (the SSD) and the second to use for your recorded projects (the HDD)...
  7. inhalexhale1 macrumors 6502a

    Jul 17, 2011
    Ridgewood, NJ
    I went through a few 2013 iMacs (both with and without FD's) and had audio issues. With FD's, I had the snap/crackle/pop. With the SSD, there was a high pitch ring that worsened depending on the sample rate. I've read some speculating it was a haswell issue, a Mavericks issue, FD issue, etc. Who knows what the problem is.

    I ended up returning it and picking up a 2012 refurb. It has a fusion drive, and has 0 issues with audio.
  8. SRHolland macrumors newbie

    Mar 1, 2014
    Fusion Drive Audio Interface 10.9.2 Fix...I hope

    I had audio dropouts after just a couple of minutes when using my MOTU 828 mkii firewire interface into Haswell iMac. (Using thunderbolt-firewire adaptor). I thought I'd have to give up the fusion drive and go to a mechanical drive or something similarly drastic. I ranted on at the Apple support guys, got the supervisor, and so on. They said they'd take it to engineering and get back to me. They never did, despite several emails from me asking for updates.
    But then the 10.9.2 update came. I've been listening to iTunes through the 828 interface for about an hour so far and it seems to be working fine.
    Fingers crossed. :eek:

Share This Page