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→Using a USB Drive for Storage
Although the boot files must be on the SD card, the Linux filesystem may be on an external drive. To use such an external drive:
# Obtain a USB disk drive and attach it to your Raspberry Pi.
# Create a partition at least as large as the second partition on the SD card using the <code>fdisk</code> command. In this example, it's assumed that this partition is the first one on the USB disk(<code>/dev/sda1</code>).
# Copy the contents of the second SD card partition to the disk drive: <code>dd if=/dev/mmcblk0p2 of=/dev/sda''1''</code>
# 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>
