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(tdn@bart) (07-05-07 22:31) (P:0 L:1) [0]                             [ 22:31:42 up  3:29,  1 user,  load average: 0.52, 0.35, 0.40]
~ $ sudo cryptsetup luksFormat /dev/sda6

WARNING!
========
This will overwrite data on /dev/sda6 irrevocably.

Are you sure? (Type uppercase yes): YES
Enter LUKS passphrase:
Verify passphrase:
Unable to make device node for 'temporary-cryptsetup-9493'
Failed to write to key storage.
Command failed.
(tdn@bart) (07-05-07 22:31) (P:0 L:1) [251]                           [ 22:31:52 up  3:30,  1 user,  load average: 0.44, 0.34, 0.39]
~ $