[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

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]
> > 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.


Reply to: