how much space to leave free on ssd?

Discussion in 'MacBook Pro' started by happle, Jan 10, 2012.

  1. happle macrumors 6502a

    Joined:
    Jun 20, 2010
    #1
    i have a 128gb ssd which has about 120gb available for use. iv heard that you need to leave a decent amount free on ssds to keep them healthy. about how much should i keep free to keep this baby working for a long time with no slow downs?
     
  2. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #2
    With any drive, HDD or SSD, you should leave at least 10% free space. More is better.
     
  3. happle thread starter macrumors 6502a

    Joined:
    Jun 20, 2010
    #3
    so would 30% free keep it performing as it did brand new?
     
  4. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #4
    30% would be fine. Remember, performance isn't only about free space. There are many other factors to consider.

    Performance Tips For Mac OS X
     
  5. happle thread starter macrumors 6502a

    Joined:
    Jun 20, 2010
    #5
    ok thanks. btw I'm strictly talking about the hard drive performance, not the whole computer.
     
  6. dusk007 macrumors 68040

    dusk007

    Joined:
    Dec 5, 2009
    #6
    Part of the SSD stays "free" anyway. It is called over provisioning and all modern SSDs do it afaik between 10-30%.
    Thus even if you use your SSD 99% for weeks it shouldn't have any problem as it technically isn't full yet but still has some extra space that you cannot use up.

    There is no need to keep 30% free. It is simply really annoying if you always run out of space and there are quite a few programms that simply crash if the hdd tells them it is full, thus you should always strife to keep around 10% free so you don't run into such troubles.
     
  7. mkrishnan Moderator emeritus

    mkrishnan

    Joined:
    Jan 9, 2004
    Location:
    Grand Rapids, MI, USA
    #7
    I didn't know much about how this works, FWIW, so I found this:

    http://www.micronblogs.com/2009/04/overprovisioning-give-a-little-get-a-lot/

    (FWIW, they also comment, that as of last June, see the comment from the original poster at the bottom, only their enterprise products, which are marketed at 50/100/150/200GB sizes instead of powers of 2, are overprovisioned.)
     
  8. dusk007 macrumors 68040

    dusk007

    Joined:
    Dec 5, 2009
    #8
    I thought they all do but you are right the C400/M4 doesn't use any over-povisioning and it is not a good thing. Intel does use just 3.4% which isn't much either with the same controller but suffer much less.
    The controller doesn't need a whole lot as it seems but still one should probably just try some manual over-provisioning in that case of a few percent.
    When creating the partitions if one leaves a few % like 3 unassigned those go to over provisioning.

    Yet still even in the worst case all filled up the drive is vastly faster than any HDD in the best case and you would never ever feel the difference in normal use as in snappiness and stuff. Some transfers might slow a bit.
    http://www.tomshardware.de/intel-ssd-320-crucial-m4-realssd-c400,testberichte-240760-4.html

    It certainly doesn't need 30% though.
     

Share This Page