I never burn any iso image using my thinkpad X41 laptop and just try yesterday when burning the new helix liveCD iso, seems not hard with cdrecord, here's how I do it,
[root@trinity ~]# cdrecord -scanbus
Cdrecord-Clone 2.01 (i386-unknown-freebsd6.1) Copyright (C) 1995-2004 Jörg Schilling
Using libscg version 'schily-0.8'.
scsibus0:
       0,0,0     0) 'IBM     ' 'CD-RW/DVD-ROM   ' 'H.2E' Removable CD-ROM
       0,1,0     1) *
       0,2,0     2) *
       0,3,0     3) *
       0,4,0     4) *
       0,5,0     5) *
       0,6,0     6) *
       0,7,0     7) *
[root@trinity ~]# cdrecord -v -pad \
speed=2 dev=0,0,0 /nsm/i-Iso/Helix_V1.8-10-05-2006.iso
cdrecord: No write mode specified.
cdrecord: Asuming -tao mode.
cdrecord: Future versions of cdrecord may have different drive dependent defaults.
cdrecord: Continuing in 5 seconds...
Cdrecord-Clone 2.01 (i386-unknown-freebsd6.1) Copyright (C) 1995-2004 Jörg Schilling
TOC Type: 1 = CD-ROM
scsidev: '0,0,0'
scsibus: 0 target: 0 lun: 0
Using libscg version 'schily-0.8'.
SCSI buffer size: 64512
atapi: 0
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : 'IBM     '
Identifikation : 'CD-RW/DVD-ROM   '
Revision       : 'H.2E'
Device seems to be: Generic mmc2 DVD-ROM.
Current: 0x000A
Profile: 0x0010
Profile: 0x000A (current)
Profile: 0x0009
Profile: 0x0008
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Driver flags   : MMC-2 SWABAUDIO BURNFREE
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R
Drive buf size : 1421312 = 1388 KB
FIFO size      : 4194304 = 4096 KB
Track 01: data   698 MB         padsize:   30 KB
Total size:      802 MB (79:27.92) = 357594 sectors
Lout start:      802 MB (79:29/69) = 357594 sectors
Current Secsize: 2048
ATIP info from disk:
 Indicated writing power: 3
 Reference speed: 6
 Is not unrestricted
 Is erasable
 Disk sub type: High speed Rewritable (CAV) media (1)
 ATIP start of lead in:  -11635 (97:26/65)
 ATIP start of lead out: 359849 (79:59/74)
 1T speed low:  4 1T speed high: 10
 2T speed low:  4 2T speed high:  0 (reserved val  6)
 power mult factor: 1 5
 recommended erase/write power: 3
 A1 values: 24 1A BC
 A2 values: 26 B2 26
Disk type:    Phase change
Manuf. index: 3
Manufacturer: CMC Magnetics Corporation
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 2255
Starting to write CD/DVD at speed 4 in real TAO mode for single session.
Last chance to quit, starting real write    0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
BURN-Free is ON.
Turning BURN-Free off
Performing OPC...
Starting new track at sector: 0
Track 01:  698 of  698 MB written (fifo 100%) [buf  99%]   4.1x.
Track 01: writing  30 KB of pad data.
Track 01: Total bytes read/written: 732317696/732348416 (357592 sectors).
Writing  time: 1200.037s
Average write speed   4.0x.
Min drive buffer fill was 99%
Fixating...
Fixating time:   70.291s
cdrecord: fifo had 11535 puts and 11535 gets.
cdrecord: fifo was 0 times empty and 11115 times full, min fill was 81%.
Then I mount my cdrom and check if the image is written properly on CD,
[root@trinity ~]# mount -t cd9660 /dev/cd0 /mnt/cdrom
[root@trinity ~]# ls /mnt/cdrom
AutoPlay        KNOPPIX         autorun.inf     helix.ico
EULA.pdf        Language        boot            index.html
IR              Static-Binaries helix.exe
It seems everything goes well, cheers to myself.
Enjoy ;]
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