What would cause Primary IDE to revert to PIO mode?

[Peter]

I noticed my PC was acting like someone had poured glue into the works
today. Scanned for malware - nothing. Did a Perf. & Maint. clean
out/defrag, still the same. Even removed restore points.
Then I noticed that the Primary IDE, normally Ultra DMA Mode 5, was now PIO.
What would cause this?
I recently ran HDTune to check my HD and it's just fine.
Found a fix on the web and it's restored thank God, but still wondering
what's going on!!
I believe it's a no-no to uninstall that channel (in order to reboot and
allow Windows to reinstall) because then it would disable the system, am I
right?

All my other channels are normal.

 

[Wesley Vogel]

IDE ATA and ATAPI disks use PIO mode after multiple time-out or CRC errors
occur
http://support.microsoft.com/?kbid=817472

DMA Reverts to PIO
http://www.michna.com/kb/WxDMA.htm

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In

 

[Carey Frisch [MVP]]

IDE ATA and ATAPI disks use PIO mode after multiple
time-out or CRC errors occur
http://support.microsoft.com/kb/817472/en-us

--
Carey Frisch
Microsoft MVP
Windows - Shell/User
Microsoft Community Newsgroups
news://msnews.microsoft.com/

---------------------------------------------------------------------------­----------------

:

| I noticed my PC was acting like someone had poured glue into the works
| today. Scanned for malware - nothing. Did a Perf. & Maint. clean
| out/defrag, still the same. Even removed restore points.
| Then I noticed that the Primary IDE, normally Ultra DMA Mode 5, was now PIO.
| What would cause this?
| I recently ran HDTune to check my HD and it's just fine.
| Found a fix on the web and it's restored thank God, but still wondering
| what's going on!!
| I believe it's a no-no to uninstall that channel (in order to reboot and
| allow Windows to reinstall) because then it would disable the system, am I
| right?
|
| All my other channels are normal.
|
| --
| Peter
| Toronto, Canada
| XP Pro SP2 Fully Updated
| P4 HT @ 3.0ghz, 360gb HD, 2.0gb DDR

 

[Peter]

Thanks Wesley. It's the first time this has ever happened. The only
contrubuting factor I can think of is that I updated my BIOS yesterday
(forgot to mention that!)
Michna's quick fix restored it.

 

[Peter]

Thanks Carey,
It's back to where it should be now...Ultra DMA Mode 5.

 

[Wesley Vogel]

Glad to hear it, Peter. Keep having fun.

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In

 

[Peter]

Happened again after doing a defrag of my external HD using Diskeeper 10
Pro. Turned out that the Maxtor drivers needed reinstalling - the disk
wasn't being read properly.
This time I uninstalled the Primary IDE Channel, rebooted and let Windows do
its thing.

 

[Wesley Vogel]

"It just goes to show you, it's always something."

--
Hope this helps. Let us know.

Wes
MS-MVP Windows Shell/User

In