disk utility error code 3 when creating windows image for bootcamp

I have an iMac and am trying to install windows via bootcamp. I have an complete windows 7 installation disk and am using disk utility to create an image. The process appears to be working with the dialogue box saying it is reading the windows file and the progress bar takes about 10 minutes to reach about 75% and then stops saying " Operation Failed" and a supplementary dialogue box appears saying "The operation couldn’t be completed. (com.apple.diskutility error 3.)"

I have tried with 2 different destination drives with the same result.

Does anybody have any suggestions or know where I can find out what the error code signifies please?

iMac, OS X El Capitan (10.11.1)

Posted on Nov 11, 2015 5:10 PM

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disk utility error code 3 when creating windows image for bootcamp

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