HEADS UP: Check your devices' UDMA settings - *TEMPORARY* *WORKAROUND*

[Nils Kassube]

Basil Chupin wrote:
> On 06/04/2011 17:45, Nils Kassube wrote:
> > Basil Chupin wrote:
> >>>> The temporary workaround for this problem is to add to the boot
> >>>> parameters the following: libata.force=X:80c
> >> 
> >> Now all I need is for someone to tell me how to get this fix into
> >> grub so that it is executed whenever I boot up. I read the grub2
> >> doco and I am buggered if I can get grub2 to automatically boot
> >> with this fix in its boot parameters :-( .
> > 
> > Which grub2 doku? I think, [1] sufficiently explains what to do.
> > Hint: GRUB_CMDLINE_LINUX="libata.force=X:80c"
> 
> Thanks again, Nils, this did the trick. All devices are now set to
> their max UDMA settings on boot-up.

You're welcome!

Out of curiosity I read the Wikipedia article about PATA [1] to find out 
how the cable type is detected. According to that article it is 
important to connect the cable in the right direction, i.e. the blue 
connector should be connected to the controller while the grey and black 
connectors should be connected to the disks. The description seemed a 
bit strange to me and therefore I searched for (an found) an old UDMA 
controller with the necessary 80 wire cable and a PATA disk. I checked 
it and actually if the cable is connected with the black connector at 
the controller and the blue connector at the disk, the controller can't 
detect the cable. I know from the result of your previous thread (Re: 
(FINAL RESULT) -- Need help, please, with burning DVDs) that you have 
opened your box. Could it be that you have connected the 80 wire cable 
the wrong way when you replaced your DVDRW drive? Then the UDMA problem 
would be your hardware and not a software bug.


Nils

[1] <http://en.wikipedia.org/wiki/Parallel_ATA#Parallel_ATA_interface>