In the raspbian installation instructions ( https://www.raspberrypi.org/documentation/installation/installing-images/linux.md ), it is recommended to unmount the device before writing the operating system image to the device. How is it possible to write bytes to an unmounted file system?
The image is written to a block device, not a file system.
dd bs=4M if=2016-05-27-raspbian-jessie.img of=/dev/sdd
The target is /dev/sdd.
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