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[solved] DVD write speed problem with Plextor PX-755SA
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LubosD
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Joined: 30 Jun 2005
Posts: 211
Location: Czech Republic

PostPosted: Fri Nov 24, 2006 2:29 pm    Post subject: [solved] DVD write speed problem with Plextor PX-755SA Reply with quote

I have a problem with my SATA CD/DVD writer Plextor PX-755SA.
Everything is fine as far as I burn only CDs - write speed goes to 48x without any problems.

But when I want to write a DVD (DVD-R(W), DVD+R(W) - it doesn't matter), the write speed NEVER gets above 1x. I use K3b (growisofs) for DVD writing.

Example:
Code:
# growisofs -speed=6 -Z /dev/sr0=/dev/zero
WARNING: /dev/sr0 already carries isofs!
About to execute 'builtin_dd if=/dev/zero of=/dev/sr0 obs=32k seek=0'
/dev/sr0: "Quick Grow" session...
/dev/sr0: "Current Write Speed" is 6.1x1352KBps.
.....many lines.....

  161677312/4706074624 ( 3.4%) @0.3x, remaining 114:18 RBU 100.0% UBU  41.9%
  163446784/4706074624 ( 3.5%) @0.4x, remaining 114:24 RBU 100.0% UBU 100.0%
  165216256/4706074624 ( 3.5%) @0.4x, remaining 114:31 RBU 100.0% UBU  16.1%
  166985728/4706074624 ( 3.5%) @0.4x, remaining 115:04 RBU 100.0% UBU  48.4%
  169050112/4706074624 ( 3.6%) @0.4x, remaining 114:57 RBU 100.0% UBU  48.4%
  170819584/4706074624 ( 3.6%) @0.4x, remaining 115:02 RBU 100.0% UBU  25.8%
  173506560/4706074624 ( 3.7%) @0.6x, remaining 114:56 RBU 100.0% UBU  32.3%
  175276032/4706074624 ( 3.7%) @0.4x, remaining 115:01 RBU 100.0% UBU  58.1%
  177045504/4706074624 ( 3.8%) @0.4x, remaining 115:06 RBU 100.0% UBU  32.3%
  180355072/4706074624 ( 3.8%) @0.7x, remaining 114:35 RBU 100.0% UBU  51.6%
  181534720/4706074624 ( 3.9%) @0.3x, remaining 115:03 RBU 100.0% UBU   3.2%
......

I don't have Windows to test this drive with something else.
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LubosD
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Joined: 30 Jun 2005
Posts: 211
Location: Czech Republic

PostPosted: Fri Nov 24, 2006 3:03 pm    Post subject: Reply with quote

Problem is SOLVED. The latest firmware (1.06) which came out recently fixed the problem for me.
I did the firmware upgrade in Windows under VMware via virtual SCSI bus. It is weird that firmware upgrade in a virtual system works, but DVD writing doesn't.
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