![]() ![]() In addition, since dd can overwrite any existing file, so you might want to do chmod 444 *.iso so that all. diskutil eject /dev/disk1 is to eject the disc for some optical drive that won't let you eject manually but requires OS X to eject the disc.It will take a while and you will see the optical drive's light blinking, if the drive has such a light. dd if=/dev/disk1 of=DiscImage01.iso is to create the ISO image in your current directory (which is your home directory if you just started the Terminal app without doing any cd command).use diskutil unmount /dev/disk1 to unmount the drive, and this command doesn't require a sudo and therefore doesn't need the administrator's password.The command will show the name, as well as the size of the disc, and it should be typically 4GB to 8.5GB. ![]() It might be /dev/disk1 or /dev/disk2, etc, depending on whether you have other drives, such as USB flash drive or SD card.
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