Simple question about how GB is calculated

Discussion in 'MacBook Pro' started by mattwolfmatt, Dec 31, 2009.

  1. mattwolfmatt macrumors 65816

    mattwolfmatt

    Joined:
    Jun 7, 2008
    #1
    I seem to recall that when Snow Leopard was released, a big deal was made about how it figures out hard drive usage. It is now base 10, or something like that. 1000 MB = 1GB, whereas before 1024 MB = 1GB.

    How do hard drive manufacturers figure this out? In other words, if I am looking to replace my hard drive with an SSD, am I comparing "apples to apples" (pun intended) with regards to what my "Finder" tells me I'm using and with what the hard drive manufacturer is saying its drive can handle?

    Thanks, and Happy New year.
     
  2. celticpride678

    Joined:
    Feb 15, 2009
    Location:
    Boston, MA
    #2
    It has nothing to do with Hard Drives. It has to do with the OS that is on the hard drive, Snow Leopard.
     
  3. mattwolfmatt thread starter macrumors 65816

    mattwolfmatt

    Joined:
    Jun 7, 2008
    #3
    I don't think you understood my question.

    This says it's 160GB. Is this number counted the same way as Snow Leopard counts it?
     
  4. Jaro65 macrumors 68040

    Jaro65

    Joined:
    Mar 27, 2009
    Location:
    Seattle, WA
    #4
    The HD manufacturers always took the liberty of advertising their drives based on their math (1000kB = 1MB), whereas the OS would use the standard convention which states that 1024kB = 1MB. They did that so that the drives would appear larger than they actually were once installed. Now since the OS assumes the same logic, the things are in parity. So for example when you buy a 250GB HD, once its formatted, the OS should show it as 250GB.
     
  5. KoolStar macrumors demi-god

    KoolStar

    Joined:
    Oct 16, 2006
    Location:
    Kentucky
    #5
    Im pretty sure that the os still follows the same 1024 logic.
     
  6. mattwolfmatt thread starter macrumors 65816

    mattwolfmatt

    Joined:
    Jun 7, 2008
    #6
    Thank you, this answered my question.

    I'm pretty sure MOST OS's follow the 1024 logic, but Snow Leopard does the 1000 logic.
     
  7. melman101 macrumors 68030

    Joined:
    Sep 3, 2009
    #7
    That is absolutely correct.
     

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