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Posted by Joerg Schilling on 04/09/07 23:34
In article <qXoSh.336$rV.46@newsfe12.lga>, root <NoEMail@home.org> wrote:
>Joerg Schilling <js@cs.tu-berlin.de> wrote:
>>
>> This really looks strange, as if the drive does not like to
>> write faster than 4x.
>>
>
>I know it is impolite to mention growisofs here, but that program
>does write the disk at 16x. It starts at 4x and ends at 18x, or so,
>with an average of 11x.
A program that does ask the drive may not suffer from incorrect answers
from the drive.
>> Are you able to repeat this test on a platform with a better SCSI
>> implementation than Linux (e.g. MS-Win or Solaris)?
>> The drive usually reports the byte offset that it does not like
>> but Linux limuts the SCSI request sense data to 16 bytes while
>> at least 18 bytes are neded in order to find out what the drive
>> does not like.
>
>Linux is all I have. If you point me to where linux sets a 16 byte
>limit I will go in and change that, recompile the kernel, and
>run the test again. I am running 2.6.20.
Solaris is easy to install and Solaris is free!
>I any case, cdrecord seems to self-limit the write speed, I suppose
>to be conservative. I have run 100 or so of the Verbatim 16x through
>the drive with growisofs and have not had a single coaster.
Cdrecord asks the drive and gets a wrong answer at one place and
no answer at another place.
For the wrong answer case I would need access to such a machine.
For the no answer case we need to find out whether this is a Linux
kernel bug or a drive firmware bug.
>> It may also be a Linux kernel bug: under some conditions, Linux
>> seems to modify SCSI commands before sending them to an ATAPI drive.
>> Your error message may also fit to this problem....
>> I did see this mayself. I got a
>>
>> Sense Code: 0x24 Qual 0x00 (invalid field in cdb) Fru 0x0
>>
>> message from Linux and after rebooting the same HW with Solaris, it
>> did not show any problem.
>>
>
>I responded to an offer from Sun for a free copy of Solaris several
>months ago. Nothing ever came of that. It was only a matter of
>curiosity since I want to support linux and would not consider
>Solaris as a permanent option.
There is no need to get a copy from Sun. Just download a recent release:
See www.opensolaris.org (Solaris express)
--
EMail:joerg@schily.isdn.cs.tu-berlin.de (home) Jrg Schilling D-13353 Berlin
js@cs.tu-berlin.de (uni)
schilling@fokus.fraunhofer.de (work) Blog: http://schily.blogspot.com/
URL: http://cdrecord.berlios.de/old/private/ ftp://ftp.berlios.de/pub/schily
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