This has pushed people into buying larger cards, such as 16GB. Not understanding what it reads and writes, win32 disk imager is unable to shrink even one byte of what it reads (the whole 8GB from Kingston) to try to fit it onto a smaller card. Although both cards claim to be 8GB, the SanDisk card is about 20MB smaller than the Kingston. Say if you want to clone your raspberry pi 2B running Raspbian Jessie on an 8GB Kingston microSD card onto an 8GB SanDisk microSD card, you simply can’t. Since win32 disk imager only reads and writes in raw format, it actually doesn’t know what it is reading/writing. You can save the image it reads and keep it as a backup or use it to clone a system. It reads in the image and writes it on an SD card. On a windows system, all you need is win32 disk imager. Raspberry pi foundation has raw images of their Raspbian and NOOB on their website. I am assuming that you don’t have a Linux machine other than raspberry pi or you are still learning Linux.
If you are already a Linux guru, this post is NOT for you. No need to do multiple build from source and apt-get etc. You just have to download their raspberry pi image and put it on your card. For example, a company that makes compact optical spectrometer, Ocean Optics, has created a spectrometer program that runs on raspberry pi and has its own web interface. Since a raspberry pi runs its OS entirely on an sd card, it is easy to clone your system so you can pass along to a friend or create your special distro for others to use. I am assuming that you have installed Raspbian or Ubuntu mate on your raspberry pi. In this post, I will explain how to back up and restore or clone a raspberry pi.
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