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Re: cd burning -- DMA problem or bug? [ Forwarded: response



	Looking though my trash bin, I came across what *might* be a
solution to the problem:
--------------------------------------BEGIN QUOTE---------------------------

Re: cd burning -- DMA problem or bug? ... and some other burning questions

From: 
"Clifford T. Matthews" <ctm ardi com>


To: 
Elton Woo <elwoo videotron ca>


Date: 
Monday 02:01:02 pm


>>>>> "Elton" == Elton Woo <elwoo videotron ca> writes:

    Elton>      Lately, I seem to be having consistent problems when
    Elton> burning ISO's with either Xcdroast, or gtoaster. Ether with
    Elton> previously used CDRW disks, or even brand new CDRW
    Elton> ones. There was discussion about DMA enabling, but my
    Elton> experience at the time, caused my system to be un-bootable.
    Elton> Oddly enough I can burn (copy) data off my drive to these
    Elton> same CD's.

    Elton>      To be more precise: I have downloaded Peanut linux,
    Elton> and *that* burned OK. Two downloads of Knoppix fail when
    Elton> burning, and the Red Hat ISO's that I downloaded a few days
    Elton> ago, also fail during the burn.  Naturally, I *always*
    Elton> check the md5sums of my downloads.

    Elton>      Hardware specs:AMD Athlon Thunderbird 1.0G, 512 Mb
    Elton> (PC-100) RAM, ASUS ATX A7V-E/550 motherboard, with a VIA
    Elton> KT133 chipset.

What's the nature of your failure?  I had two machines that had
trouble that was fixed by using -u0 instead of -u1 in hdparm for the
burners.  Up until then I had never seen any trouble with -u1.  The
symptom for both machines is that cdrecord and dvdrecord would both
appear to work fine and dmesg wouldn't show any SCSI errors, but when
examined, the burned media would have differences in a few of the
sectors.  This happened on two different systems.  One had a Plextor
CD-R burner and the other a Toshiba DVD-R burner.  The machine with
the Plextor was using an ASUS A7 flavor motherboard, I think.

I haven't seen any errors since I turned unmask IRQ off on both
drives.  Here's what hdparm has to say (I believe the errors for three
fields are due to my using ide-scsi)

[root newbie ctm]# hdparm /dev/hdc
 
/dev/hdc:
 HDIO_GET_MULTCOUNT failed: Input/output error
 IO_support   =  3 (32-bit w/sync)
 unmaskirq    =  0 (off)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 BLKRAGET failed: Input/output error
 HDIO_GETGEO failed: Invalid argument

I didn't send this to the Phoebe list because it's not Phoebe
related.  If it helps you out, you might want to send something to the
Phoebe list.

--Cliff
ctm ardi com
----------------------------------------END QUOTE---------------------------
		I get the following result on *my* system
[/dev/hdc - burner; /dev/hdd - DVD drive]

root]# hdparm /dev/hdc
 
/dev/hdc:
 HDIO_GET_MULTCOUNT failed: Invalid argument
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  1 (on)
 readahead    =  8 (on)
 HDIO_GETGEO failed: Invalid argument
------------------------------------------------------------------------]

	Comments? A but that is in or should be in bugzilla?
"Newbieized" directions on HOWTO fix?

	Elton       &>\

-- 
   http://setiathome.ssl.berkeley.edu/stats/team/team_4504.html
  "You only live once, so let's make life EASIER for each other."
  LINUX Registered User #193975. AMD-K7 ATHLON CPU power on board.
       

		
  







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