No S.M.A.R.T on FusionDrives?

Discussion in 'iMac' started by Arron924, Mar 6, 2013.

  1. Arron924 macrumors newbie

    Feb 18, 2013

    Disk Utility doesn't show any S.M.A.R.T status for my Fusion Macintosh HD, when I tried using Onyx It said this disk isn't supported is this correct?

  2. Towelie1288 macrumors regular


    Mar 1, 2012
  3. SandboxGeneral Moderator emeritus


    Sep 8, 2010
    If the HDD (and SSD) are configured for it, S.M.A.R.T. will work. It has nothing to do with how the drive is formatted. A blank drive, if configured, will report a status.
  4. macthefork, Mar 6, 2013
    Last edited: Mar 6, 2013

    macthefork macrumors 6502

    Feb 2, 2013
    In Disk Utility, both drives are shown as a single logical group. So, Apple would have to show each drive separately in order to read the S.M.A.R.T. attributes in the current Disk Utility. They likely won't do that, because it would confuse some users. Since this logical volume technology is new to Apple consumer products, give them some time. The will probably make the "Verified" or "Failed" status available in a future update of Disk Utility.

    Onyx is likely the same way.

    If you wish to read the S.M.A.R.T. status, you should be able to boot into an external drive or to the repair partition to see it separately on both drives.
  5. Brian Y macrumors 68040

    Oct 21, 2012
  6. MatthewAMEL macrumors 6502


    Oct 23, 2007
    Orlando, FL
    SMART is a hardware reporting function.

    A Fusion Drive is a logical volume independent of the physical drives underneath it.

    RAID volumes using Disk Utility don't report SMART either.

    The individual parts of a Fusion Drive will report SMART status in System Info or a utility like SMARTReporter.
  7. leman macrumors G3

    Oct 14, 2008
    As mentioned above, Fusion Drive is a logical volume and therefore has no SMART. You can check for SMART status of the physical drives using the diskutil command line utility. First check what devices (physical or logical) are present on your system via

    diskutil list

    and then check the SMART status of the disk (substitute 0 for the disk ID in question) you want via

    diskutil info disk0 | grep SMART

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