Hard drives - DMA and PIO modes

[glob]

I have recently upgraded to an Asus P5K-E motherboard. It support AHCPI SATA. I'm running Vista x64 on a Samsung HD753LJ 750GB drive.

Shortly after installing I checked the Device Manager which showed the drive running in PIO Mode 4. I kept trying to set it back to DMA mode but to no avail.

However, using HD Tune 2.55 it says my drive is running in UDMA Mode 8. I never knew it went that high.

Any idea which software is telling me the truth?

 

[sanse]

I have recently upgraded to an Asus P5K-E motherboard. It support AHCPI SATA. I'm running Vista x64 on a Samsung HD753LJ 750GB drive.

Shortly after installing I checked the Device Manager which showed the drive running in PIO Mode 4. I kept trying to set it back to DMA mode but to no avail.

However, using HD Tune 2.55 it says my drive is running in UDMA Mode 8. I never knew it went that high.

Any idea which software is telling me the truth?

what speeds shows the drive?

 

[glob]

About 80-85MB/sec

 

[sanse]

About 80-85MB/sec

sounds like hd-tune wins.

 

[glob]

Yeah. Bit weird that Vista can't work it out itself though.

 

[glob]

Just found this post. This chap has the exact same symtoms as me. Think it might be the Samsung drive or the chipset that is confusing Vista as that is what we both have in common.

AnandTech - Samsung F1 750GB - $125 shipped