Raspberry Pi OS is a Debian-derived operating system designed to help beginners and experts to get the most out of the Raspberry Pi hardware, while offering an easy-to-use desktop experience. Although you can do some basic customization before inserting your storage media into the Pi for the first time, by using the official Raspberry Pi Imager tool, you may wish that you could do more. With sdm, an SD card management tool, you can. Here’s how to do it.