transferring data from one external to another

Discussion in 'Mac Basics and Help' started by kenscanon, Jul 29, 2013.

  1. kenscanon macrumors newbie

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    Jan 28, 2013
    #1
    I have a particular technical question about computers in general.

    When one transfers data from one external hard drive to a second external hard drive, both of which are connected to the same computer, does the data that is being transferred ever get written to the computer's internal hard drive?

    I am basically wondering if transferring data between two externals is going to put a bunch of read/writes onto my MBA's internal SSD during the process.

    thanks!
     
  2. Weaselboy Moderator

    Weaselboy

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    #2
    No it does not.
     
  3. kenscanon thread starter macrumors newbie

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    Jan 28, 2013
    #3
    Cool, that is what I thought but I wasn't sure. So data is transferred directly from one drive to the other, through the computer's bus(?). I'm not too familiar with the entirety of a computer's innards.
     
  4. Weaselboy Moderator

    Weaselboy

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    #4
    Yep... exactly.
     
  5. kenscanon thread starter macrumors newbie

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    #5
    Are the "Data Read, Data written" values under the disk activity tab in Activity Monitor pulled from all disk activity (internal drives and external drives)?

    Both values are increasing at over 1 GB per minute or so, a very fast rate.
     
  6. Weaselboy Moderator

    Weaselboy

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    #6
    Yes, that includes read/write to all drives.
     
  7. old-wiz macrumors G3

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    #7
    to be exact, the OS reads it into internal buffers before it writes it out on the other drive. It does not go directly over the bus.
     
  8. kenscanon thread starter macrumors newbie

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    #8
    Internal buffers on the SSD?
     
  9. old-wiz macrumors G3

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    #9
    no... The device transfers data into the computer's buffer in internal RAM, then the software transfers to another buffer and writes it out to the other device. The data still has to go into internal ram before it can be written to another device.
     
  10. kenscanon thread starter macrumors newbie

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    Jan 28, 2013
    #10
    Ok cool, thanks for your reply. I had to move some files around, but I was wanting to try to minimize or avoid wear on the SSD since it was a large amount of data.
     

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