How much free space does an SSD need to run good?

Discussion in 'iMac' started by stanw, Oct 16, 2015.

  1. stanw macrumors 6502a

    Joined:
    Aug 29, 2007
    #1
    I calculated that the amount of space I need for my drive with the OS and applications is about 121GB. I use external drives for all of my data and am thinking of getting the 256GB SSD. How much free space will I need for it to run smoothly?

    Thanks.
     
  2. rkaufmann87 macrumors 68000

    rkaufmann87

    Joined:
    Dec 17, 2009
    Location:
    Folsom, CA
    #2
    I have 240GB SSD in my iMac with 65GB free, it runs perfectly but I like to keep an eye on the amount of available space.
     
  3. xgman macrumors 601

    xgman

    Joined:
    Aug 6, 2007
  4. rkaufmann87 macrumors 68000

    rkaufmann87

    Joined:
    Dec 17, 2009
    Location:
    Folsom, CA
    #4
    I have 68GB available on my 256GB SSD, it's working perfectly.
     
  5. Gav2k macrumors G3

    Gav2k

    Joined:
    Jul 24, 2009
    #5
    Samsung recommends 10% for optimal performance.
     
  6. im2slick4u macrumors newbie

    Joined:
    Sep 22, 2015
    Location:
    Michigan
    #6
    I have a solid state hard drive on my pc and if i put more than 50% of data on it it gets really slow. I would not recommend increwsing data over 50% so if you want to add 500 gigs of files get a one tetrabyte ssd hard drive and if you want a full tetrabyte which is more than 95% of users use i would recommend a 2 tetrabyte ssd hard drive.
     
  7. HalfOnWhole macrumors member

    Joined:
    May 23, 2011
    #7
    I routinely have less than 10% free space on my rMBP SSD and it only really slows down when that number goes below about 5%.
     
  8. dsc888 macrumors 6502

    Joined:
    Jun 25, 2010
    Location:
    Boston, MA USA
    #8
    My 2012 512Gb SSD in my rMBP still runs at full speed with 66% full. I think you are good to at least 90% capacity before you would notice any speed difference.
     
  9. Sirmausalot macrumors 6502a

    Sirmausalot

    Joined:
    Sep 1, 2007
    #9
    Either get the 512 or the 2TB fusion. 256GB is too small!
     
  10. Jimmdean macrumors 6502

    Joined:
    Mar 21, 2007
    #10
    Unless you dive pretty deep in the white papers you never really know how much an SSD is over-provisioned to begin with. It is not uncommon for SSDs marketed as "240GB" to actually be 256GB, with 24GB already set aside for over-provisioning. You'd really just have to Black Magic your drive at different capacities to figure it out...
     
  11. Cape Dave macrumors 65816

    Joined:
    Nov 16, 2012
    Location:
    Northeast
    #11
    I shoot for 50% free. That gives me PLENTY of wiggle room :)
     
  12. mikzn macrumors 6502

    mikzn

    Joined:
    Sep 2, 2013
    Location:
    Vancouver
    #12
    Just upgraded 2 lap tops with EVO 850 500's - it's worth the extra $100 to double the storage, even with external drives. Super Fast!

    El Cap boots in 15 seconds!
     
  13. jordanz macrumors member

    jordanz

    Joined:
    May 13, 2012
    #13
    Got a crucial m4 256gb in Mac mini 2011. If free space drops below ~35gb (about 15% of the drive) the write speed goes from 260mb/s to 50mb/s. Read from 400+mb/s to 70mb/s. I aim for at least 20% free to be safe at all times, you can definitely notice when the speed drops!
     
  14. qualo macrumors newbie

    Joined:
    Jul 3, 2012
    #14
    I agree. I know very little about drive costs but the upgrade to 512gb SSD actually seems to be reasonably priced to me.
     

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