file copy slows download speed?

Discussion in 'Windows 7' started by RanCorX2, Oct 9, 2012.

  1. RanCorX2

    RanCorX2 MDL Addicted

    Jul 19, 2009
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    can anyone explain why when I copy some files to another hdd while downloading something on utorrent the speed suddenly drops and then goes back up once the file copy is complete? why would that even effect my download speed?
     
  2. 100

    100 MDL Expert

    May 17, 2011
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    Each of the read/write heads on magnetic HDDs (i.e. non-SSD) can only perform one read or write operation at a time, so multiple parallel transfers are going to slow down the drive's transfer rate, especially if the files are fragmented.
    It's not the download speed that's getting slower, it's the speed at which the HDD is able to store the downloaded data.
     
  3. RanCorX2

    RanCorX2 MDL Addicted

    Jul 19, 2009
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    very informative, cheers.
     
  4. LatinMcG

    LatinMcG Bios Borker

    Feb 27, 2011
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    also IRQ sharing can cause issues if ide/sata controler is on same irq.. but most times its heads on hdd going bad
    or the limitation of hdd functions at same time ( as posted by 2nd poster)