In most cases, Ultra DMA can be enabled in the CMOS setup. I will warn you in advance: enabling Ultra DMA on a non UDMA compliant hard drive can be disastrous! As long as you're sure that your hard drive can support the extended data transfer rate, then the next factor in this would be to make sure that the system's BIOS can support it. To check this, enter the Bios' CMOS setup. This can be done by pressing DEL, in most cases, after the memory has finished counting after turning on the computer. There will most likely be a message that says something along the lines of "Press DEL to enter setup. It may also consist of some other key combination. Once you have entered the setup routine, check any/all of the categories for an option regarding "DMA Transfer" or "UDMA Channel..." Once again, if you are SURE you want to do this, enable the option, save and exit setup, and restart your computer.
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That was lame.
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