New DVD writer writes CD-R at 4x with cdrecord

super-momo · 08-01-2005, 10:21 PM

Hi, I just got a new DVD writer and I tested with a blank CD-R and 700MB of data. The writing speed is surprisingly slow at 4x with cdrecord. I checked that DMA is enabled for this driver (UDMA33). I am using Debian Etch (testing) with kernel version 2.6.8. Here is the output of cdrecord prcap,

Code:

# cdrecord -prcap dev=/dev/hdd
Cdrecord-Clone 2.01.01a01 (i686-pc-linux-gnu) Copyright (C) 1995-2004 Joerg Schilling
NOTE: this version of cdrecord is an inofficial (modified) release of cdrecord
      and thus may have bugs that are not present in the original version.
      Please send bug reports and support requests to <cdrtools@packages.debian.org>.
      The original author should not be bothered with problems of this version.

cdrecord: Warning: Running on Linux-2.6.8-2-686
cdrecord: There are unsettled issues with Linux-2.5 and newer.
cdrecord: If you have unexpected problems, please try Linux-2.4 or Solaris.
cdrecord: Warning: Linux-2.6.8 introduced incompatible interface changes.
cdrecord: Warning: SCSI transport does no longer work for suid root programs.
cdrecord: Warning: if cdrecord fails, try to run it from a root account.
scsidev: '/dev/hdd'
devname: '/dev/hdd'
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 'ubuntu-0.8ubuntu1'.
cdrecord: Warning: using inofficial version of libscg (ubuntu-0.8ubuntu1 '@(#)scsitransp.c      1.91 04/06/17 Copyright 1988,1995,2000-2004 J. Schilling').
Device type    : Removable CD-ROM
Version        : 0
Response Format: 2
Capabilities   :
Vendor_info    : 'PIONEER '
Identifikation : 'DVD-RW  DVR-109 '
Revision       : '1.40'
Device seems to be: Generic mmc2 DVD-R/DVD-RW.

Drive capabilities, per MMC-3 page 2A:

  Does read CD-R media
  Does write CD-R media
  Does read CD-RW media
  Does write CD-RW media
  Does read DVD-ROM media
  Does read DVD-R media
  Does write DVD-R media
  Does read DVD-RAM media
  Does not write DVD-RAM media
  Does support test writing

  Does read Mode 2 Form 1 blocks
  Does read Mode 2 Form 2 blocks
  Does read digital audio blocks
  Does restart non-streamed digital audio reads accurately
  Does support Buffer-Underrun-Free recording
  Does read multi-session CDs
  Does read fixed-packet CD media using Method 2
  Does not read CD bar code
  Does not read R-W subcode information
  Does read raw P-W subcode data from lead in
  Does return CD media catalog number
  Does return CD ISRC information
  Does not support C2 error pointers
  Does not deliver composite A/V data

  Does play audio CDs
  Number of volume control levels: 256
  Does support individual volume control setting for each channel
  Does support independent mute setting for each channel
  Does not support digital output on port 1
  Does not support digital output on port 2

  Loading mechanism type: tray
  Does support ejection of CD via START/STOP command
  Does not lock media on power up via prevent jumper
  Does allow media to be locked in the drive via PREVENT/ALLOW command
  Is not currently in a media-locked state
  Does not support changing side of disk
  Does not have load-empty-slot-in-changer feature
  Does not support Individual Disk Present feature

  Maximum read  speed:  7056 kB/s (CD  40x, DVD  5x)
  Current read  speed:  7056 kB/s (CD  40x, DVD  5x)
  Maximum write speed:   705 kB/s (CD   4x, DVD  0x)
  Current write speed:  7056 kB/s (CD  40x, DVD  5x)
  Rotational control selected: CLV/PCAV
  Buffer size in KB: 2000
  Copy management revision supported: 1
  Number of supported write speeds: 6
  Write speed # 0:  7056 kB/s CLV/PCAV (CD  40x, DVD  5x)
  Write speed # 1:  5644 kB/s CLV/PCAV (CD  32x, DVD  4x)
  Write speed # 2:  4233 kB/s CLV/PCAV (CD  24x, DVD  3x)
  Write speed # 3:  2822 kB/s CLV/PCAV (CD  16x, DVD  2x)
  Write speed # 4:  1764 kB/s CLV/PCAV (CD  10x, DVD  1x)
  Write speed # 5:   705 kB/s CLV/PCAV (CD   4x, DVD  0x)

Note that at the near end of the output, it says max write speed is 4x CD but current write speed is 40x (which is the correct speed). However, I can never go beyond 4x when writing using cdrecord even if I explicitly say speed=40. I think maybe cdrecord has some trouble recognizing this drive?

Any help on this problem is much appreciated!

aeruzcar · 08-02-2005, 12:20 AM

Sometimes it may be a software problem, I remember I used to have a problem like that with k3b and xcdroast, I installed nerolinux and with the same configuration I could burn dvds at 4x intead of 1x as I did with the other programs

super-momo · 08-02-2005, 12:40 AM

Quote:

Originally posted by aeruzcar
Sometimes it may be a software problem, I remember I used to have a problem like that with k3b and xcdroast, I installed nerolinux and with the same configuration I could burn dvds at 4x intead of 1x as I did with the other programs

To my knowledge k3b, xcdroast, nautilus cd writer are all front end to cdrecord, so what I really want is to get cdrecord working. I'm still puzzled by the output of cdrecord prcap, it seems to be able to test all speeds supported by the writer (correctly) and yet can't burn with more than minimum speed.