Is my harddrive slow??

Discussion in 'MacBook Pro' started by Twenty1TEN, Mar 19, 2011.

  1. Twenty1TEN macrumors member

    Sep 5, 2009
    Hey guys,

    Just ran a test on my harddrive through Xbench and the results of my drive (5400rpm, 250gb, not sure what brand) seemed kinda slow...any thoughts would be greatly appreciated


    Results 32.89
    System Info
    Xbench Version 1.3
    System Version 10.6.6 (10J567)
    Physical RAM 4096 MB
    Model MacBookPro5,5
    Drive Type ST9250827AS
    Disk Test 32.89
    Sequential 83.28
    Uncached Write 98.46 60.45 MB/sec [4K blocks]
    Uncached Write 91.22 51.61 MB/sec [256K blocks]
    Uncached Read 54.13 15.84 MB/sec [4K blocks]
    Uncached Read 118.44 59.53 MB/sec [256K blocks]
    Random 20.49
    Uncached Write 6.41 0.68 MB/sec [4K blocks]
    Uncached Write 65.11 20.84 MB/sec [256K blocks]
    Uncached Read 68.63 0.49 MB/sec [4K blocks]
    Uncached Read 108.27 20.09 MB/sec [256K blocks]
  2. kappaknight macrumors 68000


    Mar 5, 2009
    How fast do you want them to be? Where are you getting comparable numbers to think yours is slow? I don't understand why people run benchmark programs when they don't know how to look up the baseline numbers to compare them with.
  3. gmerin macrumors newbie

    Jul 18, 2008
    It's relative: generally flash ram is about 300% faster than physical disks, so compared to a new Air yours probably will always seem a bit sluggish even if you switch to scsi3 raptors ;)
  4. Twenty1TEN thread starter macrumors member

    Sep 5, 2009
    I don't know it's slow...hence why i'm asking a question...thats the purpose of a question isn't it?

    My main concern is the Random Uncached Write 6.41 0.68 MB/sec [4K blocks] is a lot slower than the this normal for a random uncached write for 4k blocks?
  5. kappaknight macrumors 68000


    Mar 5, 2009
    Again, if you don't have a baseline to compare it to, then running the bench test is pointless. I would check out Anand's website and read up on his various hard drive reviews and compare your results there.

    On a side note, what made you run the test to begin with? In all my years of buying hard drives, I've never just run a test for the hell of it since I'm not a blogger about hard drives. I've purchased 5400 RPM drives knowing they will be slow. 7200RPM drives knowing they will perform better, and 15,000 RPM drives for my DB servers knowing it will help improve overall seek time.

    It never occurred to me to test the drives unless they fail completely - and even then, testing would be pointless. I guess I just don't get why you tested them if you don't know what the numbers mean and are too lazy to google other test benchmarks.

    To answer your question: If you have a Ferrari but only need to go 3 feet, there's no need to floor the gas pedal to advance the three feet. Therefore, lower write speed for non-sequential 4k blocks is perfectly normal since the size of those blocks is proportional/significantly less than the write speed you witnessed.
  6. Jaimi macrumors regular

    Jul 22, 2009
    yes, thats all normal. Hard drives are much slower for random writes, because the head has to move much more often. If you want faster random writes, you will need to get an SSD.

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