Re: Problems with PIO, Maxtor 160Gb and A7A266 with Ali chipset
- From: Jaymon <Jaymon@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 7 Oct 2005 14:36:03 -0700
UDMA mode 5 for HD's is pretty common as is UDMA mode 2 for optical devices..
In the bios the drives should be set to auto configure and should have worked
on the same IDE channel showing UDMA mode 5 for both drives. If you manually
set them to UDMA mode 6, there en lies the problem..
j;-j
"DougCuk" wrote:
>
> I have also been battling a problem with XP SP2 showing sporadic IDE
> Hardisk errors in the system log and also falling back from UDMA to PIO
> mode. The System Event Log shows the following error:
>
> The driver detected a controller error on \Device\Harddisk0\DR0
>
> Also occasionally the following errors:
> An error was detected on device \Device\Harddisk0\DR0 during a paging
> operation
> \Device\Ide\IdePort0, did not respond within the timeout period
> Various "Delayed Write Failed" errors
>
> After a long process of testing I think I have found the root of the
> problem.
>
> I was attempting to run two ATA UDMA6 drives on the same IDE cable -
> Master drive: Samsung 40Gb SP04011N
> Slave drive: Maxtor 80Gb Diamond Max 9 (also tested a new Maxtor
> 250Gb)
>
> With both drives set to UDMA6 the Samsung reports sporadic UDMA CRC
> errors recorded by the drives SMART system and XP records sporadic
> bursts of Disk conroller errors in the System Event Log. The HD's SMART
> data can be viewed in Windows using various utilities - I used SpeedFan.
> After a while XP implements a protective UDMA fallback for the affected
> drive and ends up at PIO mode.
>
> To eliminate possible driver problems I tested the drive and cable
> setup using using the SpinRite HD testing program from Gibson Research
> (www.grc.com) - this runs from pure DOS but can test NTFS formatted
> disks - so if the problem still appears its not caused by Windows
> drivers or registry settings. SpinRite reported sporadic UDMA CRC
> errors (cabling errors) from the Samsung HD with the BIOS set to UDMA6.
>
>
> I tested an identical Samsung HD, and tried many different IDE cables
> without success. Finally I tested the Samsung HD on its own without the
> Maxtor on the cable - the fault vanished. I then restricted the Samsung
> to UDMA5 in the BIOS and retested the dual drive configuration - the
> fault had vanished. The Samsung runs fault free at UDMA6 as long as it
> is alone on the cable - but tests with two different UDMA6 Maxtor
> drives as Slave devices always caused the Samsung to become unstable at
> UDMA6 - reducing the BIOS setting for the Samsung to UDMA5 restores
> stability.
>
> It appears the two drives have some kind of conflict that causes a
> corruption of the UDMA data when attempting to run at the full UDMA6
> speeds. The errors are at a very low density and do not generally cause
> any data corruption - they just cause the drives and Windows to
> sporadically record controller errors. Unfortunately the standard
> registry settings in XP SP2 trigger a UDMA speed fallback after 6
> cumulative errors - often resulting in a rapid drop back to PIO mode
> from a single burst of controller errors.
>
> Having eliminated all other causes and being able to switch the fault
> on and off at will - I am forced to accept that the Samsung will not
> run at UDMA6 when paired with a Maxtor UDMA6 drive. The final test
> would be to try testing it paired with another Samsung drive and see if
> it works in that configuration.
>
> Note: As a safety measure XP blocks all attempts to reset UDMA for the
> affected drive to protect data integrity. And until you have eliminated
> the cause of the errors it will after a short period just revert back to
> PIO mode each time you reset the required registry settings.
>
> Once the controller errors have been eliminated you have to deleted the
> affected IDE controller in Device Manager and reboot to reinstall a
> clean copy of the registry settings. Or you can hack the registry as
> stated in the previous forum post to reset back to UDMA mode but its
> more hassle.
>
> Hope this lengthy report is of some assistance to others with a similar
> type of problem.
>
>
> --
> DougCuk
> ------------------------------------------------------------------------
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>
.
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