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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: {{Admon/tip|SD Card is Only Used for Booting|If you're using a root filesystem on a USB drive, once the system has booted, you can remove the SD card!You can then use the SD reader to load photos from a camera card, make another SD card for your Raspberry Pi, or backup your SD card to another one.}}
