only 929.5gbs in time capsule. Where did it all go?

Discussion in 'Mac Accessories' started by iCantwait, Jan 16, 2008.

  1. iCantwait macrumors 65816

    iCantwait

    Joined:
    Sep 3, 2007
    Location:
    Melbourne, Australia
    #1
    I was checking out time capsule on apple.com and in the screen shot it only had xxxgb of 929.5 gb Tcapsule can't use that many gbs in formatting
     
  2. samh004 macrumors 68020

    samh004

    Joined:
    Mar 1, 2004
    Location:
    Australia
    #2
    That's about right for a 1TB disc. Someone else better at numbers can explain the difference between 1000 and 1024.
     
  3. thefunkymunky macrumors 65816

    Joined:
    Feb 24, 2005
    Location:
    London
    #3
    Its a hard drive. This happens with all hard drives. Has done for years.
     
  4. sammich macrumors 601

    sammich

    Joined:
    Sep 26, 2006
    Location:
    Sarcasmville.
    #4
    okay, short and simple, 1 "terabyte" hdd = 1000 000 000 000 = 10 ^12 bytes
    1 terabyte = 1024 * 1024 * 1024 * 1024 = 1024 ^ 4 bytes.

    10^12 / 1024^4 = 931.32. Get it?

    You can blame the hard drive industry for this numerical confusion.
     
  5. samh004 macrumors 68020

    samh004

    Joined:
    Mar 1, 2004
    Location:
    Australia
    #5
    I knew someone would explain things, I just didn't realise he'd live in a toaster...
     
  6. iCantwait thread starter macrumors 65816

    iCantwait

    Joined:
    Sep 3, 2007
    Location:
    Melbourne, Australia
    #6
    so how come my 1gb stik holds 999.8mb? amd not 931.32mb?
     
  7. DNH macrumors member

    Joined:
    Oct 15, 2003
    Location:
    Halifax, NS, Canada
    #7
    Not to be picky, but your math is slightly incorrect.

    1 gigabyte = 1024^3 bytes
    1 terabyte (hdd) = 10^12 bytes

    10^12 / 1024^3 = 931.32 GB

    --

    Regarding the USB stick, it may be that the stick holds a true gigabyte (1024^3 bytes).

    Using the same convention, you might expect the following true capacity:
    1 megabyte = 1024^2 bytes
    1 gigabyte (stick) = 10^9 bytes

    10^9 / 1024^2 = 953.67 MB


    And yes, it took something this silly to draw me into posting for the first time in a looooong while.
     
  8. sammich macrumors 601

    sammich

    Joined:
    Sep 26, 2006
    Location:
    Sarcasmville.
    #8
    Thanks DNH, as usual when it comes to maths I assume that if it looks almost right, it's close enough:p.

    Regarding the flash drives, it may vary from manufacturer to manufacturer, some may use the 'true' mega/gigabyte storage capacities. Maybe it's the price of the OEM flash chips or the size that depends on how much space they have. Eg: my '512 meg' sony MS Duo only has about 470 megs.

    One last thing: for extremely high end devices (ie SSD's and 10k+ rpm hard drives) manufacturers use the true values. ie the 64 gig SSD drive in the MBA actually is 64 gigs (64 * 1024 ^ 3 bytes).
     

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