Fusion drive question

Discussion in 'iMac' started by nordster68, Jan 17, 2014.

  1. nordster68 macrumors newbie

    Jan 17, 2014
    I was wondering if anyone can tell me about creating a fusion drive by
    Merging a ssd with a standard hard drive by using terminal. In particular
    I would like to know if it makes a difference using a 5400 or 7200 drive. I
    am wondering if the extra speed of the 7200 is made redundant by the basic
    nature of how a fusion drive works. Any help or thoughts would be fantastic.
  2. chevalier433 macrumors 6502a


    Mar 30, 2011
  3. nordster68 thread starter macrumors newbie

    Jan 17, 2014
    Thanks for the info but?

    Thanks for the info but my question was not so much about how to create a fusion drive but to understand if there is a difference or advantage to using a 7200rpm drive as apposed to using a lesser speed 5400 drive. Given the nature of how fusion drives work. Thanks
  4. Bear macrumors G3

    Jul 23, 2002
    Sol III - Terra
    Not everything you read from the fusion drive will come from the SSD, therefore the 7200 RPOM dribe will help fror rads from the HD por4tion of the Fusion Drive. Also if you're doing a lot of writing to the FD at one time, you will wind up writing firectly to the HD.

    In short, the 7200 RPM drive is a better idea unless there is a possible heat issue. The 2012 and 2013 21.5" iMacs may have a heat issue with 7200 RPM drives since they were designed around 5400 RPM drives.
  5. nordster68 thread starter macrumors newbie

    Jan 17, 2014
    Thank you Thank you Thank you

    Thanks Bear. That is exactly what i needed to know.
  6. gnasher729 macrumors P6


    Nov 25, 2005
    Don't get fixated on "5400rpm" vs. "7200rpm". Hard drives get slower as they fill up, so an almost full 1TB drive will be slower than a 1/3rd full 3TB drive, no matter what the rpm.
  7. nordster68 thread starter macrumors newbie

    Jan 17, 2014
  8. Fishrrman macrumors G5


    Feb 20, 2009
    There's something else to consider as well.

    If you leave the two drives "un-fused", you will get faster operation out of the SSD, particularly if you have a lot of files, particularly larger ones. Remember that one of the functions of "CORE storage" is that less-frequently-accessed files get shuffled around from SSD to HDD, etc.

    Of course, you will have to "manually manage" what goes where on the two individual drives.

    For some folks, this is a problem.
    For me, no problem at all.

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