Typical SSD reported/sold capacity differences?

Discussion in 'MacBook Air' started by hyphz, Nov 4, 2012.

  1. macrumors newbie

    Joined:
    Jan 7, 2011
    #1
    So, I have a 2010 MacBook Air which came with a 256gb SSD. On "available" space on Get Info, it lists 250gb available. Now, OK, I know that typically this value is not identical to the sold size of the drive. But my rather elderly MacBook Pro, with a 320gb HD, still lists 319.21gb available.

    So does that mean that 6gb of my SSD cells have already rotted, in spite of the machine not being used all that much? If so that's... worrying!
     
  2. macrumors 6502

    msjones

    Joined:
    Oct 18, 2007
    Location:
    Nottinghamshire, UK
  3. macrumors 6502a

    Joined:
    Jan 23, 2010
    Location:
    San Diego, CA USA
    #3
    You do realize the operating takes space your disk, right? Didn't you notice all those programs pre-installed on your Mac when you got it. They take space. Nothing is 'rotted'.
     
  4. thread starter macrumors newbie

    Joined:
    Jan 7, 2011
    #4
    Thanks for your replies.

    Mfram, I'm looking at the total size of the disk in Get Info, not the amount of free space.

    Msjones, I'm aware of filesystem overhead, but both the MBP and the MBA are running HFS+ filesystems under Mountain Lion so it seems a bit strange that the MBP should have 0.79gb of filesystem overhead while the MBA has 6gb worth.

    Is there a recovery partition installed when a system is shipped with Mountain Lion? Could that be it?
     
  5. macrumors member

    Joined:
    Nov 25, 2010
    #5
    Perfectly normal. I have a 2012 MacBook Air with a 256GB SSD that reports the same.
     
  6. macrumors P6

    Weaselboy

    Joined:
    Jan 23, 2005
    #6
    Yes. There is a 650MB recovery partition.
     
  7. macrumors 6502

    Joined:
    Oct 12, 2012
    #7
    Exactly
     

Share This Page