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Posted by root on 04/08/07 18:02
Joerg Schilling <js@cs.tu-berlin.de> wrote:
>
>
>>> Did you run a test with "readcd f=/dev/null" or better:
>>>
>>> readcd meshpoints=20
>>>
>>
>>My tests were run using dd.
>
> So you ignore miy advise? Why?
I had not used readcd and did not know how to define the device. I
have since then read about readcd and run your test. The speed
was identical to that given by dd.
For comparison I give you the leading results from readcd when
applied to two different drives:
First for a BenQ drive which claims 5x read speed for DVD-RAM:
Read speed: 6925 kB/s (CD 39x, DVD 5x).
Write speed: 2770 kB/s (CD 15x, DVD 2x).
Capacity: 2236704 Blocks = 4473408 kBytes = 4368 MBytes = 4580 prMB
Sectorsize: 2048 Bytes
Copy from SCSI (1000,0,0) disk to file '/dev/null'
Now, for the Pioneer 112D which also claims 5x read:
Read speed: 2770 kB/s (CD 15x, DVD 2x).
Write speed: 2770 kB/s (CD 15x, DVD 2x).
Capacity: 2236704 Blocks = 4473408 kBytes = 4368 MBytes = 4580 prMB
Sectorsize: 2048 Bytes
As you can see the Pioneer does read at 2x.
>
> Cdrecord tries to prevent you from writing bad media, but it fo course
> allows you to prevent it from artificially limiting you. Did you read the
> documentation and follow the advise?
>
>
I tried the force options you suggested by none increased the
write speed to that achieved by other drives using the same
blanks or that speed achieved by growisofs.
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