512GB SSD showing as 500GB?

Discussion in 'MacBook Pro' started by majorchestnut, May 13, 2010.

  1. macrumors newbie

    Feb 21, 2010
    Bought the new 2010 MacBook Pro, and went for the 512GB SSD option. In Disk Utility/System Profiler, it's reporting a capacity of 500.28GB under Snow Leopard. Is this normal?
  2. macrumors 6502a


    Jan 28, 2010
    The OS takes up some space right? :rolleyes: However, 12GB seems like too much.

    Isn't there a few different "standards" to calculate space. Like binary and something else I can't think of?
  3. macrumors 6502

    Apr 16, 2010
    Marketing hype. For capacity advertising, they count 1000MB = 1GB. For purposes of calculation in OS X, 1024MB = 1GB.

    500 x 1.024 = 512
  4. macrumors 601


    Sep 19, 2008
    That is perfectly normal and it's not the OS taking up space. There are different standards or methods use to count a GB. OS X probably counts it different than the drive manufacturer. Most drives will say in the drive specs as to how a GB is calculated 1 GB = 1,000,000,000 bytes.

    I have a 128 GB Runcore SSD in my MBA and it shows up as 128 GB. However, the stock SSD only showed up as 120.9 GB. The larger the drive, the larger the discrepancy is going to be as it can be calculated as a percentage of the drive space.

    This is truly a "Not to worry" moment. BTW OP, is it Apple's 512 GB SSD? How is it in terms of speed? Have you run an xBenchmarking test on it to see the read/write performance of the SSD?

    Congrats on the nice computer!
  5. macrumors regular


    Apr 7, 2008
    Mac OS X 10.6 Snow Leopard uses the "capacity advertising" method of calculation. My 500GB hard disk shows up as a 500 or 499.something GB hard disk.

    So I must say I'm surprised at what the OP is finding.
  6. macrumors 601


    Sep 26, 2006
    ^^ exactly

    I'm going to go out on a limb and guess that the drive in the OP's computer isn't the 512 GB SSD...
  7. macrumors regular

    Jul 15, 2009
    Dublin, Ireland
    agreed, OP can u post system profiler data on the HDD
  8. macrumors 6502

    Feb 28, 2010
    They say 512 but you probably have software and stuff that is taking up space. But i don't know. Go get it checked out at Apple.
  9. macrumors 6502

    Apr 5, 2010
    Saint Augustine, FL
    Believe it or not, this isn't marketing hype.... way back in the early days of hard drives, the international sizing standard stated that 1 KB = 1000 bytes, and 1 MB=1000 KB. Disk standards are different from RAM (memory)

    Your drive is fine, enjoy!
  10. macrumors 601


    Sep 26, 2006
    500GB is the capacity, the maximum amount you can store. You're describing remaining which is what is left over with software and data on it.
  11. MRU
    macrumors demi-god


    Aug 23, 2005

    Click on the apple on the top left menu bar.

    Click on about this mac.

    Click on More Info

    On the left pane click on Serial-ATA | in the right pane you should see your drive listed.

    Please select / highlight & copy and paste the info here. We will be able to tell you if it is the SSD or a HDD.
  12. macrumors 6502

    Dec 1, 2008
    Wow, the 512GB SSD option cost more than my MBP (~20%)... It better be fast :)
  13. macrumors regular

    Mar 8, 2010
    My 128gb ssd on had 120gb capacity, plus all the OS (and windoze) files take ~10Gb when it's all said and done.
  14. thread starter macrumors newbie

    Feb 21, 2010
    Sorry for the late response guys:

    Yes, it's Apple's 512 SSD option. No benchmarks run yet, but very, very fast in everyday use (near instant startup, iTunes runs superbly well now when adding music/movies)

    I know there was much debate in the past about a 500GB hard drive being reported as less in the OS, but I thought I'd pose this question anyways because since I upgraded to Snow Leopard on my last MBP, my 640 or 750GB hard drives were actually reported as 640/750GB under disk utility. Thought it was odd that it'd be different again for SSDs.

    I'll post screenshots when I get off work.
  15. macrumors 6502a


    Nov 15, 2007
    same here. i can understand if theres less space than the advertised but why is it actually MORE than the advertised?? wouldnt the companies want to advertise more?
  16. macrumors regular

    Feb 2, 2010
    It's the same thing as that my 1tb Harddrive shows only 936gb, and not 1000gb/1tb.
  17. thread starter macrumors newbie

    Feb 21, 2010
  18. macrumors 601


    Dec 5, 2007
    Yay Area, CA
    Um... you guys are all wrong here...

    SSDs keep some space not usable for reliability purposes. If one sector the SSD is worn too much or damaged or whatever, it will use that reserve to make up for the space. Therefore, a 128GB SSD is actually a 120GB (Counted as 1000) or 111GB (Counted as 1024). 512GB is 500GB (Counted as 1000) or 465GB (Counted as 1024).

    Intel SSDs does not use this count. On a Intel SSD, a 80GB is really 80GB. However, if you were to dissect it a little, you'll find it's more like 86GB.

    This type of branding is totally up to the manufacturer.

    For conventional hard drives, it's just the numbering issue. A 1TB drive is 1TB when counted as 1000 but only 931GB when counted as 1024. 500GB is 465GB, etc.
  19. macrumors 6502a


    Jan 31, 2010
    you should cross out the important info, ie serial #. people with stolen macbook pros might use your serial number and lie. or something like that.
  20. thread starter macrumors newbie

    Feb 21, 2010
    Good idea, thanks
  21. macrumors 601


    Feb 6, 2010
    On the fence
    Yeah, it's like if you have an iPod with flash memory, a 4GB is roughly 3.6, and my 8GB touch actually holds 7.08. Flash memory is typically that way.

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