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We do not need this device directly, but GParted requires it. This should give us the device /dev/loop0p1, which represents the first partition in myimage.img. We want to access the partitions that are on the image, so we need to ask the kernel to load those too: sudo partprobe /dev/loop0 The device /dev/loop0 represents myimage.img. Let's create a device of the image: sudo losetup /dev/loop0 myimage.img

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The command returns the path to a free loopback device: /dev/loop0 Let's request a new (free) loopback device: sudo losetup -f Let's enable enable the loopback: sudo modprobe loop We do this using the loopback-functionality of Linux. This is why we first need to create a device for the image. GParted operates on devices, not simple files like images.

In order to shrink the image, GParted is going to be used along the first part of the answer. GParted is an application typically used to manage partition tables and filesystems.

img you want to shrink ( myimage.img in this example) The secret is to use standard Linux tools and instruments: GParted, fdisk and truncate. Having a myimage.img bigger then the hardware support (if it is smaller there should be no problem however, using the same strategy, you can better fit the image in the hardware support). For example: umount /dev/sdc1Д¬reate a copy of the whole sd card with all the partitions unmounted dd if=/dev/sdc of=/path/to/file/myimage.img Unmount all partitions of the device you want to copy on your pc. Use lsblk to see which devices are available and if their partitions are mounted

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Following the full solution in order to not lose the answer.ДЄ preliminary step consists in cloning the SD card in your PC: The key information was the use of the command truncate.

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It is quite similar to the other one, but it better explains how to calculate and which meaning have the numbers and the partitions. This article gives a solution that solves my problem. You clearly want to shrink an SD card image. You cannot resize an SD card as it is hardware with a given capacity that cannot be changed. Please note: as observed by Melebius in a comment, the right word to use is shrink: I/O size (minimum/optimal): 512 bytes / 512 bytesДevice Boot Start End Sectors Size Id Type Sector size (logical/physical): 512 bytes / 512 bytes I have read the question and answer Cloning multiple partitions in Ubuntu, but I still cannot re-size the 16GB SD card into a 4GB one. img of the SD card continues to be 16 GB with 12 GB of unallocated space.

I have tried with GParted: it creates a partition with 4GB with no problem, however the whole. How can I re-size a 16GB SD card image into a smaller 4GB? img with other people but if I use the command dd if=/dev/sdXX of=/home/user123/SD.img I have a 16 GB SD card with a Linux based OS for a Raspberry Pi.

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