My Asus mb has a Primary & Secondary IDE setting in the BIOS for '32bit transfer mode' ... it's disabled by default. I can find little info on this setting. The mb manual offers no description, Google was no help and a Search here only mentions it once (a suggestion to prevent write errors was to disable it).
What exactly is '32bit transfer mode'? What benefits/drawbacks are there in enabling it?
Enabling this setting allows for 32-bit data transfers between the processor and the PCI bus. Actual transfers to the disk are always done 16 bits at a time, but enabling this option will cause a small performance improvement on the transfer from the bus to the processor.
If your disk supports this, enable it for a performance increase. Disable it if you encounter any difficulty or if your disk doesn't support it.
... didn't help that I was searching for '32bit' instead of '32-bit'.