Problem with cdrecord-ProDVD recording speed [REPOST]

[Roberto Sebastiano <robs@multiplayer.it>]

Sorry if I repost this message, but I found that this is a 
common problem and I can't find a solution on the net.


I have a NEC 3500 Dvd Writer.
I have problems with the recording speed.
I tried two different brands of dvd-r (one from princo that is certified
for 4x recording, and one from philips that is certified for 8x), but
cdrecord-ProDVD always writes the DVDs at 6x speed.

Here is the output of the program; tell me if I can supply additional
debugging data.


newdeal:/mnt# cdrecord-dvd -dev=/dev/hdc -speed=4 -dao -data guida.iso
Cdrecord-ProDVD-Clone 2.01b31 (i686-pc-linux-gnu) Copyright (C)
1995-2004 Jörg Schilling
Unlocked features: ProDVD Clone 
Limited  features: 
This copy of cdrecord is licensed for:
private/research/educational_non-commercial_use
scsidev: '/dev/hdc'
devname: '/dev/hdc'
scsibus: -2 target: -2 lun: -2
Warning: Open by 'devname' is unintentional and not supported.
Linux sg driver version: 3.5.27
Using libscg version 'schily-0.8'.
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   : 
Vendor_info    : '_NEC    '
Identifikation : 'DVD_RW ND-3500AG'
Revision       : '2.17'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Using generic SCSI-3/mmc-2 DVD-R/DVD-RW driver (mmc_dvd).
Driver flags   : DVD MMC-3 SWABAUDIO BURNFREE 
Supported modes: PACKET SAO
Starting to write CD/DVD at speed 6 in real SAO mode for single session.
Last chance to quit, starting real write    0 seconds. Operation starts.


Why it writes at 6x while I stated -speed=4 ? (the same if -speed=8)


Thanks and sorry for the repost,
-- 
Roberto Sebastiano <robs@multiplayer.it>