[conspire] cd burning giving slight errors

Peter Knaggs peter.knaggs at gmail.com
Mon Nov 7 01:16:25 PST 2011

Hi Sean,

Thanks for taking a look. I added the -dao flag,
still get errors writing (less, though, only four wrong bytes
this time).

Output looks as follows.

I'm using a CD-RW media now, to avoid making
so many coasters.

The only thing I can think of that I changed on this
system was adding some more memory.
I've run the memtest and it passed OK,
and I've done repeated parallel kernel builds
which ran fine, so I guess the memory is OK.

I'm debugging a problem in Inkscape at the
moment, quite bizarre behavior, but at least I get
to practice debugging a C++ program for a change.


$ wodim speed=1 -dao -v dev=/dev/scd0 -data ubuntu-11.10-desktop-amd64.iso
TOC Type: 1 = CD-ROM
wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
scsidev: '/dev/scd0'
devname: '/dev/scd0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Wodim version: 1.1.11
SCSI buffer size: 64512
Device type    : Removable CD-ROM
Version        : 5
Response Format: 2
Capabilities   :
Vendor_info    : 'ATAPI   '
Identification : 'iHAS222   8     '
Revision       : '4L01'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.
Current: 0x000A (CD-RW)
Profile: 0x002B (DVD+R/DL)
Profile: 0x001B (DVD+R)
Profile: 0x001A (DVD+RW)
Profile: 0x0016 (DVD-R/DL layer jump recording)
Profile: 0x0015 (DVD-R/DL sequential recording)
Profile: 0x0014 (DVD-RW sequential recording)
Profile: 0x0013 (DVD-RW restricted overwrite)
Profile: 0x0012 (DVD-RAM)
Profile: 0x0011 (DVD-R sequential recording)
Profile: 0x0010 (DVD-ROM)
Profile: 0x000A (CD-RW) (current)
Profile: 0x0009 (CD-R)
Profile: 0x0008 (CD-ROM)
Profile: 0x0002 (Removable disk)
Using generic SCSI-3/mmc   CD-R/CD-RW driver (mmc_cdr).
Supported modes: TAO PACKET SAO SAO/R96P SAO/R96R RAW/R16 RAW/R96P RAW/R96R
Drive buf size : 1867008 = 1823 KB
Beginning DMA speed test. Set CDR_NODMATEST environment variable if device
communication breaks or freezes immediately after that.
FIFO size      : 12582912 = 12288 KB
Track 01: data   697 MB
Total size:      800 MB (79:20.18) = 357014 sectors
Lout start:      801 MB (79:22/14) = 357014 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:  -11596 (97:27/29)
  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: 4
  A1 values: 24 1A C8
  A2 values: 26 B2 4A
Disk type:    Phase change
Manuf. index: 20
Manufacturer: Princo Corporation
Blocks total: 359849 Blocks current: 359849 Blocks remaining: 2835
Forcespeed is OFF.
Speed set to 1765 KB/s
Starting to write CD/DVD at speed  10.0 in real SAO mode for single session.
Last chance to quit, starting real write in    0 seconds. Operation starts.
Waiting for reader process to fill input buffer ... input buffer ready.
Performing OPC...
Sending CUE sheet...
Writing pregap for track 1 at -150
Starting new track at sector: 0
Track 01:  697 of  697 MB written (fifo 100%) [buf 100%]  10.6x.
Track 01: Total bytes read/written: 731164672/731164672 (357014 sectors).
Writing  time:  488.544s
Average write speed   9.7x.
Min drive buffer fill was 99%
Fixating time:   15.180s
BURN-Free was never needed.
wodim: fifo had 11517 puts and 11517 gets.
wodim: fifo was 0 times empty and 11312 times full, min fill was 95%.

$ readom -v dev=/dev/scd0 f=./testing_read
scsidev: '/dev/scd0'
devname: '/dev/scd0'
scsibus: -2 target: -2 lun: -2
Linux sg driver version: 3.5.27
Read  speed:  7057 kB/s (CD  40x, DVD  5x).
Write speed:  1765 kB/s (CD  10x, DVD  1x).
Capacity: 357014 Blocks = 714028 kBytes = 697 MBytes = 731 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (2,0,0) disk to file './testing_read'
end:    357014
addr:   357014 cnt: 22
Time total: 167.613sec
Read 714028.00 kB at 4260.0 kB/sec.

$ cmp -l testing_read ubuntu-11.10-desktop-amd64.iso
 40983529  73  43
 40983545 166 366
191329272  66  62
300276720 130 120

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