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copying usb images or iso : error 254 in disk images

6623 Views 1 Reply Latest reply: Mar 31, 2013 10:48 AM by Linc Davis RSS
candlewax48 Level 1 Level 1 (0 points)
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Mar 31, 2013 4:01 AM



I am repeatedly trying to copy usb to usb using the Restore function in disk utility (ie, just copying the whole disk image)


I am also trying to unpack an iso onto a usb


However, each time I try, i get 1 of 2 error messages:


"could not validate source - invalid argument"


and  "could not validate source - error 254"



any ideas ?      thankyou

Mac OS X (10.7.2)


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