I copied my windows 7 cd to a ISO and trying to source the image onto my USB drive from OSX. So far it doesn't seem like it's possible with disk utility. Is there something else I can do to make this work?
Of course, the command line is always there to help.
Insert the USB flash drive and run the command
diskutil listto find out the disk name, we'll use
/dev/disk1as an example.
Now unmount the disk using
diskutil unmountDisk /dev/disk1
Now we are ready to copy the ISO to the device:
dd if=/path/to/Win7.iso of=/dev/disk1 bs=8192