LUKS on DVD+RW

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Hi,

I just tried to encrypt a DVD+RW in packet write mode.
Does anyone has done this successfully?
I tried the following:

# dvd+rw-format -force /dev/dvd
# pktsetup 0 /dev/dvd
# cryptsetup -c "aes-cbc-essiv:sha256" -s 256 -q luksFormat /dev/pktcdvd/0
Enter LUKS passphrase: 
Failed to setup dm-crypt key mapping.
Check kernel for support for the aes-cbc-essiv:sha256 cipher spec and verify that /dev/pktcdvd/0 contains at least 258 sectors.
Failed to write to key storage.
Command failed.

(BTW there is a newline '\n' missing at the end of »Command failed.«)

Any hints?
Thanks
Lars

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