Why is the hard drive so slow?

Discussion in 'Mac Basics and Help' started by Foxglove9, Aug 25, 2007.

  1. Foxglove9 macrumors 68000


    Jan 14, 2006
    New York City
    I've been reading up a bit about hard drive speeds and brands. So I decided to run xbench and measure the resultsd of my 3 hard drives. What I can't figure out is why my macbook drive is that much slower. I know it's 5400 RPM but I didn't think it would be almost half as slow?

    Powermac G5 1.8 ghz (single core) w/ 2.5 gb ram
    Internal SATA - Maxtor 7200rpm 200gb (158 free) = scored 93.33
    Internal SATA (2nd) - OEM 7200rpm 80gb (48 free) = scored 51.81

    Macbook C2D 2.18 ghz w/ 2 gb ram
    Internal SATA - Fujitsu 5400rpm 120gb (80 free) = scored 36.26
  2. mkrishnan Moderator emeritus


    Jan 9, 2004
    Grand Rapids, MI, USA
    It seems pretty typical... most of the results posted on the xbench site peg it at around 40. As I understand it, beyond the 5400/7200 issue, 2.5" drives are intrinsically also slower because the circumference is typically less (because the disk has a smaller radius). So if you think about it, on a typical track of a 7200 RPM 3.5" drive, the path length is longer per revolution than on a 2.5" drive of the same rotational speed. So the 3.5" drive reads more on each of those 7200 rotations.

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