iMac SSD performance over time

Discussion in 'iMac' started by kureus, Oct 29, 2014.

  1. kureus macrumors newbie

    Joined:
    Jun 2, 2014
    #1
    As I understand it for an SSD to perform well over time it's lifespan it needs 2 things, TRIM enabled and to be over provisioned. I believe Apple have been enabling TRIM in select drives since 10.6.8. If I bought a new iMac with flash storage today would they also over provision the drive and leave some space unallocated or would I need to do that myself?

    I have a mid 2011 iMac with a spinning hdd for reference!
     
  2. steve23094 macrumors 68000

    steve23094

    Joined:
    Apr 23, 2013
    #2
    No, you don't need to do it yourself. Apple take care of this.
     
  3. kureus thread starter macrumors newbie

    Joined:
    Jun 2, 2014
    #3
    What sort of percentage do they leave unallocated?
     
  4. steve23094 macrumors 68000

    steve23094

    Joined:
    Apr 23, 2013
    #4
    I don't know the figure off the top of my head, but I'm sure you can find it if you dig around the internet.

    Here is the figure for a Fusion drive, and also how to calculate on any other Apple SSD (near the bottom of the page):- http://www.anandtech.com/show/6679/a-month-with-apples-fusion-drive/2
     
  5. kureus thread starter macrumors newbie

    Joined:
    Jun 2, 2014
  6. tillsbury macrumors 65816

    Joined:
    Dec 24, 2007
    #6
    Out of interest, my 768gb SSD in the MBP has been my main drive for over two years and 4 OSX versions, never more that 10% free space and still the same speed as ever with no management required.
     

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