If its just win9X/ME, then you are basically limited to a DMA check box.
If you are using win2k/XP then it will say UMDA for ata33/44/66/100/133 or DMA for low end drives that are just ata ~ 16mb/sec transfer rates. Still not entiry helpful.
If the drive is on a 80wire IDE cable then it should default to the fastest ata mode supported by either the drive or controller (whichever is lower).
If you wish to find out exactly what it is, i believe (though im not certain) that SiSoft Sandra will tell you the exact UDMA mode.
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