Re: Non-RW media; WORM hopes

El S=C3=A1bado, 16 de Junio de 2007, RB escribi=C3=B3:
> > Again, you can not put a udf filesystem on it.  You need to use cdrwtool
> > to only format the track, which I believe was the -m option.
>
> I wish I had good news...  Reading through the source of cdrwtool
> (udftools-1.0.0b3) and using strace, I'm able to follow the execution
> of '-m' up to the point that it actually tries to send the packet
> containing the format to the CD (cdrwtool.c:424), which fails
> immediately with a return value of EIO.  I thought it was the fact
> that cdrwtool.h tries to reference HZ in it's timeouts, but hardcoding
> those to sane values did nothing for me.  In three different drives
> from three different manufacturers, I get the following with virgin
> Imation CD-R media:
>
> [root@tst ~] cdrwtool -d /dev/hdc -m 359846
> using device /dev/hdc
> formatting 359846 blocks
> 1751KB internal buffer
> setting write speed to 12x
> wait_cmd: Input/output error
> Command failed: 04 17 00 00 00 00 00 00 00 00 00 00 - sense 05.30.06
> format disc: Illegal seek
>
> Afterwards, using 'cdrwtool -i' the discs then [usually] show 295264
> free blocks, as opposed to the prior 359846, but 'dd if=3D/dev/zero
> of=3D/dev/hdc bs=3D32k' gives EROFS and fails.  I swear I see a 'dotted'
> burn just around the center of the media (inside the area usually
> burned during fixation), but the usually visible "ring o' death" I've
> seen after my 'cdrecord --packet' experiments is not evident.

Since when you can write directly over a cd, without executing ATA commands=
?.

> I've got ide-cd.ko and cdrom.ko compiled with all the debugging
> options turned up, but don't see anything in the kernel logs that give
> me any indication as to why it's failing.  The sense failure is as
> cryptic as anything, and while I'm sure the 0x17 command is
> significant (0x10, or '1 << 4' seeming to be IMMED), the 0x07 portion
> seems like a magic number - I guess it came out of one of the rainbow
> books, but none of the source documents it.  I'm learning kernel code
> as I go here, so somebody smack me if I'm being dumb.  Any other
> ideas?
>
>
>
> RB



=2D-=20
Gustavo Guillermo P=C3=A9rez
Compunauta uLinux
www.compunauta.com