iMac 3TB HDD is slower than 1TB

Discussion in 'iMac' started by barefeats, Dec 22, 2012.

  1. barefeats, Dec 22, 2012
    Last edited: Dec 22, 2012

    macrumors 65816

    barefeats

    Joined:
    Jul 6, 2000
    #1
    Just tested both with QuickBench 4.04.

    Large 1TB Sequential Custom Test (average of 5 iterations):
    1TB = 208MB/s READ, 207MB/s WRITE
    3TB = 174MB/s READ, 173MB/s WRITE

    Also faster on small random writes:
    1TB = 57MB/s
    3TB = 38MB/s

    Tested two 3TB in case it was a dud. No dud. Just slower.

    Not a huge deal but just thought you would like to know.

    P.S. Those are not Fusion Drives -- just the regular HDDs.
     
  2. macrumors 6502

    Joined:
    Oct 11, 2012
    #2
    What drive models?

    There have been indications that Apple is using more than one disk vendor in each system type. Can you post the model numbers of the particular drives you tested?

    Thanks.
     
  3. thread starter macrumors 65816

    barefeats

    Joined:
    Jul 6, 2000
    #3
  4. macrumors member

    Joined:
    Nov 27, 2012
    #4
    3 TB drives are slower by design due to the more dense-packed platters (single disks inside the HDD)
     
  5. macrumors 68000

    Outrigger

    Joined:
    Dec 22, 2008
    #5
    Shouldn't the drives be faster due to the more dense packed platters?
     
  6. macrumors regular

    Metal Dice

    Joined:
    Jun 3, 2009
    Location:
    Denmark
    #6
    I would really like for us to be able to conclude on this. Is there anybody that could confirm the results of barefeats.
     
  7. macrumors 6502a

    Joined:
    Oct 21, 2011
    #7
    No. As the data is smaller the reader has to squint harder to read it.
     
  8. macrumors regular

    Metal Dice

    Joined:
    Jun 3, 2009
    Location:
    Denmark
    #8
    Is there anybody else that could contribute with benchmark results or something. It find this HDD speed difference very important, but it seems as if I'm alone.
     
  9. macrumors member

    Joined:
    Jan 17, 2009
    #9
    No, that's simply untrue.

    Higher areal densities mean there's more data crammed into the same amount of space, which means that once the read-write head scans any given block, it will read/write more in a given moment than if the density were lower.

    Increased areal density therefore leads to increased speeds. The more gigabytes you can pack onto a platter, the faster your hard disk drive should become.
     
  10. macrumors 601

    Mr. Retrofire

    Joined:
    Mar 2, 2010
    Location:
    www.emiliana.cl
    #10
    Source?
     

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