I had an ext3 partition. I ran a dd command like this:

dd if=/dev/urandom of=/dev/part2 bs=1024 count=15000 seek="various values"

Where various values are basically 0, 15000K, 30000K etc.

The point is I ran the dd command on the entire partition.

Now the partition won't mount. I get an error "Can't find ext3 partition on ..."

Questions:

1. What exactly happened to the partition? I know it got corrupted, but what exactly happened? As a clue fsck /dev/part2 gives "The superblock could not be read or does not describe a correct ext2 filesystem."

2. How do I format it back to ext3?