THIS PROCEDURE WILL DESTROY ALL DATA ON /DEV/SDA sudo umount /dev/sda* 2>/dev/null # unmout /dev/sda if mountedĮcho -e "o\nn\np\n1\n\n\nw" | sudo fdisk /dev/sda # reformat /dev/sda Copy the running root filesystem to the USB device. Format a USB device to a Linux format and create an ext4 filesystem. Adjust if different as any mistakes may cause data lost and require rebuilding the SD card. This procedure assumes a single OS on the Pi in two partitions with only a single USB drive to be formatted and used. The boot partition can not be reformatted on the running Pi system as the kernel is running, if it is reformatted, it will only change on reboot and may not boot up at all. The first vfat partition of the SD card contains the boot instructions and the the Linux kernel (unless NOOBS or PINN is installed, see below). Reboot and both new filesystems are running on the SD card. Check and correct the root device in both /boot/cmdline.txt and /etc/fstab on the SD card to the root partition on the SD card. Remove the boot filesystem from the SD card and copy the new OS boot filesystem to the SD card boot partition. Remove the root filesystem from the SD card and copy the new OS root filesystem to the SD card root partition. Reboot and running on the root filesystem in the USB device, download the new OS. Change the root device in the SD card /boot/cmdline.txt and the USB device /etc/fstab to the USB root partition.
Copy the running root filesystem to a USB device.
Yes, it is possible to rewrite the SD card without removing it, but not with the normal install procedures.
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