packet-writing with UDF on CD-RW

Hi the list,

First of all, I little browsed archives and Raoul's howto, but
unsuccessful :-(

My setup :

* kernel 2.6.17.6 (same on last 2.6.17.10) on i686 compiled by me with
udf & packet-writing support
(I don't use udev)
* udftools 1.0.0b3-11
* cdrecord 4:2.01+01a03-5
* ASUS DRW-1608P3S

Nota : burning CD & DVD works fine.

* cdrecord -scanbus dev=ATA
Cdrecord-Clone 2.01.01a01 (i686-pc-linux-gnu) Copyright (C) 1995-2004
Jrg Schilling

scsidev: 'ATA'
devname: 'ATA'
scsibus: -2 target: -2 lun: -2
Warning: Using badly designed ATAPI via /dev/hd* interface.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
scsibus1:
        1,0,0   100) 'ASUS    ' 'DRW-1608P3S     ' '1.19' Removable CD-ROM
        1,1,0   101) *
        1,2,0   102) *
        1,3,0   103) *
        1,4,0   104) *
        1,5,0   105) *
        1,6,0   106) *
        1,7,0   107) *

* cdrwtool -d /dev/hdc -i
using device /dev/hdc
1222KB internal buffer
setting write speed to 12x

DISC INFO:
	erasable : Yes
	border = 0
	Disc status = 0
	number of first track = 1
	number of sessions = 1
	number of tracks = 1
	status of last track = 1
	uru = 0
	did_v = 0
	dbc_v = 0
	disc type = 255
	disc_id = 0
	lead_in = 97:34:23 (439073)
	lead_out = 79:59:74 (359999)
	OPC entries = 0

TRACK INFO:

Track 1
	track_number = 1
	session_number = 1
	damage = 0
	copy = 0
	track_mode = 7
	Rt = 0
	blank = 1
	packet = 0
	fp = 0
	data_mode = 15
	lra_v = 0
	nwa_v = 1
	track_start = 0
	next_writable = 0
	last_recorded = 0
	free_blocks = 359847
	packet_size = 0
	track_size = 359847 (719694KB)

Ok, so let's try the suff :

* cdrwtool -d /dev/hdc
using device /dev/hdc
1238KB internal buffer
setting write speed to 12x
wait_cmd: Input/output error
Command failed: 55 10 00 00 00 00 00 00 3c 00 00 00 - sense 05.26.00
00 00 00 00 00 00 00 00 05 32 20 27 0a 00 00 00 20 00 00 00 00 20 00 96
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 08 00
mode_select: Illegal seek
set_write

What's wrong ?
Any suggestions ?

Thanks in advance.

-- 
Fred.