Mailinglist Archive: opensuse (2731 mails)

[David <dcorking@xxxxxxxx>]

Hi Joe!

On Sun, 10 Aug 2003, Joe Morris (NTM) wrote:

> On 08/10/2003 10:31 AM, David wrote:
> 
> >Got a new UDMA motherboard last year and started getting burn problems
> >with CD-RW ide-scsi emulation that I never had before (with the same
> >drive and same Linux on my old slow EIDE motherboard.)  No consistent
> >error messages, tried lots of different CD-R and CD-RW blanks
> >
> >So I had to disable UDMA on the CD-RW to get it to burn
> >using
> > 
> >
> Do you mean disabling it in the BIOS?

Nope - I mean disabling it in the kernel - which is what the hdparm does.

My BIOS Setting give hardly any control (KS75A mobo)
 
> >hdparm -d1 X34 /dev/hdc
> >
> >which I put in 
> >/etc/init.d/boot.local
> >
> Which ENABLES DMA.  Actually, yours enables for udma 33.  Just curious 
> as it appears my CDRW has finally gone bad, and I was just wondering...

UDMA is a very fast form of DMA which seems to be buggy in my older
CD-RW.

Disclaimer - I don't understand all that follows - it was merely good
enough for me.

This is what hdparm says :-

> sudo /sbin/hdparm -i /dev/hdc

/dev/hdc:

 Model=SONY CD-RW CRX140E, FwRev=1.0n, SerialNo=
 Config={ Fixed Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=on/off, tPIO={min:180,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  sdma0 sdma1 sdma2 mdma0 mdma1 *mdma2 
 UDMA modes: udma0 udma1 udma2 
 AdvancedPM=no


Notice that the star is agains the mdma2 - this is a result of the X34
command I put in in the boot script.

WIthout this it comes up with the * agains one of the umda modes
(umda2 as far as I recall) and fails early in burns - and makes
coasters.

Thats all
David