SCSI cd-writer with an old 7300

[Matteo Bertolini <berNIENTESPAMmat@cbmail.it>]

I have a TEAC CDR55S cd-writer witd ID 3 in my SCSI chain.
Giving

>cdrecord -v -dummy speed=1 dev=0,3,0 -data gigi.iso >burnlog 2>&1

I have a burnlog like this:

scsidev: '0,3,0'
scsibus: 0 target: 3 lun: 0
Linux sg driver version: 2.1.40
WRa Data 00 0A 00 00
Cdrecord 1.10 (powerpc-unknown-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
TOC Type: 1 = CD-ROM
Using libscg version 'schily-0.5'
atapi: 0
Device type    : Removable CD-ROM
Version        : 2
Response Format: 2
Capabilities   : RELADR SYNC LINKED 
Vendor_info    : 'TEAC    '
Identifikation : 'CD-R55S         '
Revision       : '1.0R'
Device seems to be: Teac CD-R50S.
Using driver for Teac CD-R50S, Teac CD-R55S, JVC XR-W2010, Pinnacle RCD-5020 (teac_cdr50).
Driver flags   : SWABAUDIO
Buffer cap: 655360
Drive buf size : 655360 = 640 KB
FIFO size      : 4194304 = 4096 KB
Track 01: data  617 MB        
Total size:     708 MB (70:14.21) = 316066 sectors
Lout start:     709 MB (70:16/16) = 316066 sectors
Current Secsize: 2048
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 43783
Starting to write CD/DVD at speed 1 in dummy mode for single session.
Last chance to quit, starting dummy write in 9 seconds.

Afete a few seconds:

SCSI disk error: host 0 channel 0 id 4 lun 0 return code = 6000000
scsidisk I/O error/ dev 08:14, sector NNNNNN

and other lines like that with different NNNNN

Then box stop. I can only make a HW reboot.
What can I do?

cdrecord -scanbus says:

Linux sg driver version: 2.1.40
Cdrecord 1.10 (powerpc-unknown-linux-gnu) Copyright (C) 1995-2001 Jörg Schilling
Using libscg version 'schily-0.5'
scsibus0:
	0,0,0	  0) 'QUANTUM ' 'FIREBALL SE2.1S ' 'PJ0A' Disk
	0,1,0	  1) *
	0,2,0	  2) *
	0,3,0	  3) 'TEAC    ' 'CD-R55S         ' '1.0R' Removable CD-ROM
	0,4,0	  4) 'SAMSUNG ' 'WN34324U (gm028)' '0104' Disk
	0,5,0	  5) *
	0,6,0	  6) *
	0,7,0	  7) *


Thanks,
	Matteo.