encrypted external drive

I recently purchased a large external drive. Using dm-crypt to set it up.


# cryptsetup luksFormat /dev/sdb

WARNING!
========
This will overwrite data on /dev/sdb irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:
Command successful.

# mmls /dev/sdb

Cannot determine partition type

# cryptsetup luksOpen /dev/sdb myfs

Enter LUKS passphrase for /dev/sdb:
key slot 0 unlocked.
Command successful.


# mkfs.ext2 -m 0 /dev/mapper/myfs >> /documentation/external_fs_inode_info

(why waste 5% of your disk space on an external hard drive?)

# mount -t ext2 /dev/mapper/myfs /mymountpoint

# cd /mymountpoint; dd if=/dev/urandom of=crap; rm -f crap