Enabling UDMA 6 on P4C800 Deluxe

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crapbottom

All,
Boot screen reports all (4) of my SATA Maxtor 160s as UDMA6, however, my
WinXP Pro SP1a Device Manager and latest Aida32 report the drives using
UDMA5.

I thought I had all of the latest drivers, etc. Any ideas ?
Thanks.
 
more info.

The (2) drives connected to the Promise RAID SATA, configured as IDE, are
functioning as UDMA6, but the ones connected to the Intel SATA 802801EB
Ultra ATA controller are not.

I can't find anything on ASUS or Intels websites.
 
SATA does not use UDMA transfer modes. Whatever any BIOS readout or
utility says, ignore it. They just have to call it something so Windows
doesn't complain.
 
crapbottom said:
All,
Boot screen reports all (4) of my SATA Maxtor 160s as UDMA6, however, my
WinXP Pro SP1a Device Manager and latest Aida32 report the drives using
UDMA5.

I thought I had all of the latest drivers, etc. Any ideas ?
Thanks.
Click to expand...

The latest intel chipsets only support UDMA5, if you want UDMA6 you'll have
to use the onboard RAID controller.

It won't make a difference anyway.
 
In the support area asus writes:

Why is my serial ata HDD?(WD360GD (Raptor)) detected as UDMA5
under windows? (as it should be?at least UDMA6 or higher)? What can I do to
fix this?




This is because ICH5 southbridge communicates with serial ata HDD
through the similar protocol as its parallel ata connctors (supporting up to
UDMA5 mode), which makes windows mis-detect it as running under UDMA5 mode.
Microsoft will going to release a new patch to fix this issue soon.
 
This is because ICH5 southbridge communicates with serial ata HDD
through the similar protocol as its parallel ata connctors (supporting up to
UDMA5 mode), which makes windows mis-detect it as running under UDMA5 mode.
Microsoft will going to release a new patch to fix this issue soon.
Click to expand...

That's only half-right, the issue is that ICH5 SATA drives are forced to
use MS's generic IDE drivers. This eliminates any of SATA'a advanced
functions, as the SATA drives essentialy emulate Ultra ATA ones. What
is supposed to happen is that the Intel INF installs it's own drivers,
but in XP/2k it doesn't work. And MS already did release a patch, but
it doesn't work either and is not publicly available anymore.

But, as already pointed out, it doesn't make one bit of difference for
performance. The only thing you really lose at this point is hot-swap
ability.
 
The latest intel chipsets only support UDMA5,
Click to expand...

That is true, but irrelevant. Serial ATA's theoretical transfer is
1.5Gbps, if Intel's SATA controller didn't support this it wouldn't
**BE** an SATA controller. UDMA transfer is a totally different issue.
It won't make a difference anyway.
Click to expand...

Exactly, no drive today even comes close to SATA's max rate. They're
not even halfway there yet.
 
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