Re: DVD writing speed (1x!) on a Samsung TS-H552U
On Wed, 2005-04-13 at 10:21 -0400, Bill Davidsen wrote:
> >$ dvd+rw-mediainfo /dev/hdc
> >INQUIRY: [TSSTcorp][CD/DVDW TS-H552U][US03]
> >GET [CURRENT] CONFIGURATION:
> > Mounted Media: 1Bh, DVD+R
> > Current Write Speed: 8.0x1385=11080KB/s
> > Write Speed #0: 8.0x1385=11080KB/s
> > Write Speed #1: 6.0x1385=8310KB/s
> > Write Speed #2: 4.0x1385=5540KB/s
> > Write Speed #3: 2.0x1385=2770KB/s
> > Speed Descriptor#0: 00/2295103 R@8.0x1385=11080KB/s W@8.0x1385=11080KB/s
> > Speed Descriptor#1: 00/2295103 R@8.0x1385=11080KB/s W@6.0x1385=8310KB/s
> > Speed Descriptor#2: 00/2295103 R@8.0x1385=11080KB/s W@4.0x1385=5540KB/s
> > Speed Descriptor#3: 00/2295103 R@8.0x1385=11080KB/s W@2.4x1385=3324KB/s
> Note that there doesn't seem to be any 1x descriptor. This probably
> eliminates deleting the wrong descriptor somehow. Is it possible that
> your disk simply can't provide data any faster and that you're getting a
> bunch of underruns?
I would be surprised, it is off a brand new SATA disk.
> For example, if you were burning a backup of a lot
> of little files, with lots of directory accesses, you might get an
> underrun due to all the seeks.
The files I was writing were originally from nfs, but I believe that
they had already been combined into an iso, see below:
> Can you try creating the ISO image first and then burning? Or ar you
> already doing that?
I was using nautilus-cd-burner to do the burning, which seems to create
the iso itself, and then call growisofs with that iso, and in the debug
log, it calls growisofs with:
growisofs -dvd-compat -use-the-force-luke=tty -Z /dev/hdc=/tmp/image.iso.Q11JAK
Which seems to imply that it is already using an iso.