zcat precise-preinstalled-mobile-armel+omap.img.gz > /dev/sdc1
e2fsck 1.41.12 (17-May-2010) fsck.ext3: Superblock invalid, trying backup blocks... fsck.ext3: Bad magic number in super-block while trying to open /dev/sdc1 The superblock could not be read or does not describe a correct ext2 filesystem. If the device is valid and it really contains an ext2 filesystem (and not swap or ufs or something else), then the superblock is corrupt, and you might try running e2fsck with an alternate superblock: e2fsck -b 8193 <device>
gunzip precise-preinstalled-mobile-armel+omap.img.gz dd bs=4096 if=precise-preinstalled-mobile-armel+omap.img of=/dev/sdd1