Caviar Black - 1TB vs 2TB

Discussion in 'Mac Pro' started by lbeck, Nov 13, 2010.

  1. lbeck macrumors 6502

    lbeck

    Joined:
    Dec 5, 2009
    #1
    I have one of ezch of these and test results from xBench and AJA System test show the 1TB being significantly slower. Speeds are below

    1TB (model name: WDC WD1001FALS-41Y6A0)
    Read 89 Mb/s
    Write 88 Mb/s

    2TB (model name: WDC WD2001FASS-00W2B0)
    Read 133 Mb/s
    Write 123 Mb/s

    Is this normal?

    EDIT: could it be that the 1TB has 32mb cache and the 2TB has 64?
     
  2. alust2013 macrumors 601

    alust2013

    Joined:
    Feb 6, 2010
    Location:
    On the fence
    #2
    It is due to the larger cache as well as the much higher data density.
     
  3. lbeck thread starter macrumors 6502

    lbeck

    Joined:
    Dec 5, 2009
    #3
    Thanks, makes perfect sense :)
     
  4. Cynicalone macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #4
    I have 3 of the 2TB Blacks they are great HDD's.
     
  5. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #5
    Caches have nothing to do here. xBench uses uncached data for the test, so, the numbers are due, like a previous poster said, to higher density in the platters of the 2TB drive.
     
  6. Transporteur macrumors 68030

    Joined:
    Nov 30, 2008
    Location:
    UK
    #6
    That depends on the current filling level of your drives. For a 50% filled drive, the speeds are indeed absolutely normal. Empty drives, however, should be considerably faster.

    I recall that my empty 1TB Blacks (WD1001FALS-00J7B1) make about 120MB/s sustained.
    An empty 2TB Black reaches 145MB/s.
     
  7. khollister macrumors 6502a

    khollister

    Joined:
    Feb 1, 2003
    Location:
    Orlando, FL
    #7
    Yup - which is why you should be buying 2TB drives even if you don't think you need them. I had a 2TB Caviar Black that was writing to blocks about 70% in and the rates dropped to 90 MB/s. The outer tracks have a huge bandwidth advantage due to the linear speed under the heads - size matters :)
     
  8. 3587 macrumors 6502a

    Joined:
    Mar 23, 2008
    #8
  9. jav6454 macrumors P6

    jav6454

    Joined:
    Nov 14, 2007
    Location:
    1 Geostationary Tower Plaza
    #9
  10. scottsjack macrumors 68000

    Joined:
    Aug 25, 2010
    Location:
    Arizona
    #10
    I replaced two 1TB black drives that had about 1.5TB of photography spread between them. The 2TB black drive feels much quicker in daily use. Needless to say the remaining 1TB black drives are going to go away over time. The 2TB Caviar Black drive is just that much better.
     
  11. 300D macrumors 65816

    300D

    Joined:
    May 2, 2009
    Location:
    Tulsa
    #11
    Incorrect.
    "Uncached" refers to the system cache. The computer has no control over the hard drive's cache.
     
  12. xyzzy-xyzzy macrumors member

    Joined:
    Sep 19, 2010
    #12
    When I want to know opinions about company "foo" I first do a google search on the term "foo opinions") to see what I can find. I did this with ecost (google search string "ecost opinions" and a quick survey of what I found generally was "stay away from them". As always with these things there are good experiences and bad. But the general consensus looks to me as bad in my quick survey. YMMV
     

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