You need to decide how big you want it to be du -h and df may be useful in this regard (see man du and man df all the commands below also have man pages worth at least a glance). The MBR is critical and occupies the first 512 bytes in the image.Ī device image starts as an empty file. the master boot record (MBR), since this is a device image. There are two partitions in the Raspbian image, the first small boot partition and the second larger root filesystem. You could use the pi itself to do this if you have storage big enough attached. Some of these commands need to be run root so I recommend you just su root. You then need to copy the contents of each partition in as per my other answer here. This answer describes how to create a device image with filesystem partitions in it, but those partitions will be empty. See here for more about these important distinctions. This is distinct from a filesystem image, which is a byte for byte copy of a single partition. I'll discuss this in relation to Raspbian but it is the same for any other GNU/Linux system.Ī device image is for our purposes a complete byte for byte copy of a bootable device medium such an SD card, which may contain zero or more filesystem partitions. You can't shrink a device image (although you can shrink an individual filesystem with resize2fs), but you can create one of whatever size and duplicate the contents of another one.
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