Q: How do I disable UDMA mode 5 (ATA100) under Windows XP with SP1. The default UDMA mode 4 (ATA66) no matter what I do. The only way to UDMA mode 5 is able to install the Intel Application Accelerator. However, for some reason, it changes the transfer mode of my dvdrom multi Word DMA 2 to pio4. So is there a way to UDMA 5 possible without installing the Intel Application Accelerator?
Re:I have heard that WinXP will drop the UDMA speed on the drive if it gets a read/write error, etc. I had this issue as well. At the time, I had a Zip hooked on the same chain, so this might have been the reason for the errors or whatever was causing it to drop.
My solution – Install the Intel Application Accelerator, and forget about it.
Re:I have the same problem, so help would be appreciated.
Specs:
EPoX 4BDA
P4 2.0A @ 2.7GHz
512MB Corsair XMS3200
PNY GF4 Ti 4400 @ 4600
SBLive! Audigy
Linksys 10/100
WD 100GB Special Edition
Toshiba 16x DVD
Lite On 32×12x40 CDRW
I see we have the same motherboard (other than yours adding onboard RAID), so that might be the source of our problem. I guess I will try that Intel accelerator and hope it doesn't mess with my other drives 
EDIT: I installed the utility and according to it everything is running in the proper mode 
Re:BUMP
Anyone?
Re:Yes, the cables are ata100 for sure. With intel application accelerator installed, it runs at udma mode 5 and benchmarking with hd tach confirms it. However, the downside is that it forces my dvdrom to run at pio4. I have the Maxtor Diamond Max plus 30GB model.
I have p4-1.6A@2.24, i845 mobo (epox 4bda2+), 256MB of ram, with winxp sp1 and lastest intel chipset drivers. Oh well, i guess i'll just leave it alone.
Re:are your cables ATA100 for sure?
Re:what hdd do you have?
some manufacturers offer an utility to switch the ata mode of the hdd!
Re:not sure why, but my XP is running mode 5.
BIOS issue maybe?
Chipset driver issue?
80pin cable installed?
or maybe just not bother trying to solve this mystery?
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