free space differ in info and "about this mac"

Discussion in 'Mac Basics and Help' started by guido.coza, Oct 20, 2016.

  1. guido.coza macrumors member

    Joined:
    Jan 12, 2011
    Location:
    South Africa
    #1
    I SADLY recently updated from Mavericks to sierra and had to downgrade to Yosemite. What a mess!!
    I feel like an Wicrosoft user all over again, but that is not the point!
    There is a new feature in yosemite that lets you check "storage" in About my mac. There it states that I have 15GB of 121GB free space available.
    The HD/SSD icon and "info" however gives me 36GB free space!??
    why the difference and can I somewhere see the "purgeable" space one can check in Sierra ??
     
  2. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #2
    There are two ways to calculate storage space, one is to count via Gigabytes (1 byte = 8 bits and 1 Gigabyte is 1024 MegaBytes, recall that 1 Megabyte is 1024 Kilobytes and that 1 KiloByte is 1024 Bytes), basically power of 2.

    The other method is to just go straight into the Giga- Mega- Kilo- prefixes and calculate space not in power of 2 but in power of 10.

    Both are correct in either case, you just need to understand which one you are reading.

    [...]

    Also wrong forum, this is iOS, not Mac OS X forum.
     
  3. guido.coza thread starter macrumors member

    Joined:
    Jan 12, 2011
    Location:
    South Africa

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