Raspberry Pi SD Cards and Images

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How to burn an SD image on Mac OS

Run Disk Utility
Insert the SD card where you will burn the image
Check in Disk Utility the disk Number
Eject the SD partition
Open a terminal and type matching the Number, the path and name of the image
sudo dd if=///dir_path/input_image.img of=/dev/rdiskNumber bs=1m

How to backup a Raspberry SD card

Run Disk Utility
Insert the SD card
Check in Disk Utility the disk Number
Eject the SD partition
Open a terminal and type matching the Number path and name of the image
sudo dd if=/dev/rdiskNumber of=///dir_path/output_image.img bs=1m

How to shrink a Raspberry Pi image

In Ubuntu:
sudo apt-get install dcfldd
sudo ./raspbian-shrink -f -m 1024 /home/interactionstation/Desktop/player_sync_stretch_empty_spaces_fixed.img /home/interactionstation/Desktop/videosyncfinal.img
More info:
https://github.com/aoakley/cotswoldjam/tree/master/raspbian-shrink

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