You should send me your comments on twitter here. Your USB drive (or SD Card) should be bootable now, loaded with the contents of your ISO image file. Just hit return now, enter your mac user password if it prompts for and wait for the process to complete. The full command would then look something like, sudo dd if=/Users/username/Downloads/some_very_cool_disk_image.iso of=/dev/disk2 Now hit ‘space’ key and complete the command by typing of=/dev/disk2 (where disk2 is the identifier you’d found). iso file is situated, drag it from there to the opened Terminal window (where you typed the command). Now open up the Terminal app (should be inside Applications > Utilities) and type sudo dd if= in it. Just select it and click ‘Unmount’ in the top bar. Your USB drive should have a partition which is shown as a part of it in the same sidebar (usually named ‘Untitled’). Second step is to unmount the partition so that you don’t get the Resource busy error. Lets say, in your case, the identifier you found is called ‘disk2’. It should be something like ‘disk2’ or ‘disk3’. Now click the info button on the top bar. Just open up Disk Utility (yea, that same dreadful app), find your USB drive on the sidebar and click it. First things first, you need to find out the ‘identifier’ for your USB (or SD Card). There’s a simple command you can run in the Terminal app instead, which does the trick. Turns out, Disk Utility is useless for this work. Even ‘Scan Image for Restore’ option returned the same error. It simply did not work I kept getting those ‘Could not validate source’ errors. iso file source recently using Disk Utility on the Mac OS (10.9). I was trying to restore a USB volume with a. FebruISO image to USB drive or SD Card on a Mac (without using Disk Utility)

Mac burn iso file to usb