hdd udma

  • Thread starter Thread starter M3ntos
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M3ntos

Hello,

I have the following problem with my windows xp box:
- my dvd (pioneer) is connected with 80-conductor cable.
- my motherboard is correctly handling udma of my hdd.
- bios detects that this dvd (at the moment: the only one on my primary
ide cable) is capable of udma 66
- win xp has the "udma if possible" set.
But I have still dvd running in pio mode.

Could anyone tell me where might be the problem ?

With regard,

Tomek Mêciñski
 
M3ntos said:
Hello,

I have the following problem with my windows xp box:
- my dvd (pioneer) is connected with 80-conductor cable.
- my motherboard is correctly handling udma of my hdd.
- bios detects that this dvd (at the moment: the only one on my
primary ide cable) is capable of udma 66
- win xp has the "udma if possible" set.
But I have still dvd running in pio mode.

Could anyone tell me where might be the problem ?

With regard,

Tomek Mêciñski
Click to expand...

Try this KB:
http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q247951 How to
enable UDMA66 mode on Intel chipsets.

Q
 
The primary IDE channel is not for CD/DVD devices and is better suited for
HD's set to master/slave or computer select w/UDMA 5 mode set for both
drives. The secondary IDE channel For the CD/DVD drives set the same as above
w/UDMA 2, both set automatically by a PNP OS..ie..XP...
j;-j
 
Still. you will need to locate the IDE Ultra DMA drivers for that
motherboard. They should help.
 
Jaymon said:
The primary IDE channel is not for CD/DVD devices and is better suited for
HD's set to master/slave or computer select w/UDMA 5 mode set for both
drives. The secondary IDE channel For the CD/DVD drives set the same as
above
w/UDMA 2, both set automatically by a PNP OS..ie..XP...
j;-j
Click to expand...


Jaymon:
With relatively modern motherboards & components the Primary IDE channel can
be used to connect *any* IDE/ATAPI device whatsoever without any performance
issue being raised. There's *no* reason why an optical drive cannot be
connected to the Slave position on the Primary IDE channel. It will not
affect its performance one iota. If, for some reason, the physical layout of
the motherboard makes it more convenient to connect an optical drive to the
Primary Slave position, there's no harm in doing so. And similarly, there's
no problem performance-wise if a secondary HD is connected anywhere on the
Secondary IDE channel. Years & years ago, there *could be* a performance
issue with these type of connections, but that time has long since past.

It *is* true that all things considered, it's always (or nearly always) best
to connect the booting HD to the Primary Master position. Some motherboards
have a problem when the bootable drive is located on another position. But
it's probably moot, since you would be hard-pressed to find a booting HD
that's connected to a position *other" than the PM one.
Anna
 
Try going through some of the steps from MVP Hans-Georg Michna's site
here:
http://www.michna.com/kb/WxDMA.htm
Click to expand...

What a star!

I had a failing Plextor PX-708A in my Asus Pundit barebones, so I
swapped it for a new Gigabyte drive and found to my horror that the new
drive was running in PIO mode and this had dire effects.

I subscribed to this group, searched for DMA, found this article,
checked the above web page, applied the change in "Re-enable DMA
using the Registry Editor", rebooted, and now the drive is showing
UDMA Mode 2. Result!

I now have a sinking feeling that the Plextor is just fine and that the
problems I was having with it were to do with XP switching it to PIO
mode - ah well, at least I have a spare drive now.
 
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