The pre-built Ubuntu 11.04/Pandaboard image is designed to be installed on a SD card. It could be transfer to the USB HDD with some extra efforts. Typically, a bootable OMAP4/Ubuntu SD card contains two partitions: boot and rootfs. Only rootfs should immigrate to a USB drive since Pandaboard requires booting form SD card. Prepares a bootable Ubuntu11.04 SD card. howto Create a ext3/4 partition on