You will be using that as the SD card target for writing, as well as the file name of the disk image to write to the target SD card. Locate the SD card in the diskutil list output and make note of the rdiskNUMBER disk identifier associated with the SD card. You must have the disk identifier for the target SD card you wish to write the img file to, thus we’ll first run diskutil list: img file to write somewhere easily found as well, we’re assuming here that it will be in your current working directory. To get started, launch Terminal app from the /Applications/Utilities/ folder. Using dd this way to write an SD card image is similar to how you’d use dd to burn an ISO to a USB drive or another disk image, except of course the file format is different and so is the target. Nonetheless, dd works just fine as long as you have an understanding of the command line. A simpler option for most users is to use a third party app like Etcher to write an image to an SD card. For example, you might use this for writing a boot image for a RaspberryPi or some other quick-boot linux setup. Using dd from the command line to write an image to an SD card is considered advanced, so this is best for users who are comfortable with the command line.
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