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→Using a USB Drive for Storage
# Since the copy was made of the SD card while it was in use, the filesystem copy on the hard disk will be marked as "dirty". Use the filesystem check command to check and clean it: <code>fsck -y -f /dev/sda''1''</code>
# Edit <code>/boot/cmdline.txt</code> to change the root device: <code>root=/dev/sda1</code>
# You should now be able to boot to your USB disk drive. Note: once the system has booted, you can remove the SD card!