Is 100 Mbs read and 100 Mbs Write in Blackmagic Disk Speed Test

Discussion in 'Mac Apps and Mac App Store' started by waloshin, Aug 14, 2013.

  1. waloshin macrumors 68040

    Oct 9, 2008
    Is 100 Mbs read and 100 Mbs Write in Blackmagic Disk Speed Test good for a laptop? Not a ssd just a regular 2.5" harddrive.
  2. cledet macrumors regular


    Mar 26, 2012
    San Francisco, CA
  3. AppleDeviceUser macrumors 6502


    Jan 7, 2012
    I am getting 325MBs write and 400MBs read however my system is slow right now normally they are both at about 500MBs. I do have 512GB SSD so that could be why. I think your speed is not bad considering it's a HDD, my mom has a 2011 MacBook Pro and it's about 50Mbs read and write.
  4. thekingofnerds macrumors regular

    Jun 26, 2013
    That's actually quite good for a laptop HDD. Generally they are closer to 60-70MB/s.

    I know the crap one that came with my mac mini only gets around 40-50. It's almost too slow to use as a media drive even.
  5. MathBunny123 macrumors regular

    Oct 19, 2012
    Toronto, Canada | Sibiu, Romania
  6. ArchAndroid macrumors regular


    Aug 26, 2012
    London, England
    Thats actually a really good score for a HDD. When I ran that test with my WD Blue 750GB HDD, I was getting around 80-90MB/s. The more you fill it up though, the slower it will become.
  7. dusk007 macrumors 68040


    Dec 5, 2009
    It will get slower though as you fill it.
    Innermost tracks on the spinning disk are about 50-60% of the speed of the outermost tracks. Fill it up to 80% and you will be at 60 MB/s. That has nothing to do with fragmentation just that a HDD starts writing on the long outer tracks and works its way inward as it fills up.

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