I just built a new box (TBIRD 900, KT7A, Via 4 and 1 drivers, IBM 46GB and Toshiba 16x DVD) and installed Win me on the box. I noticed that if I right click in Device manager on the hard drive and then select the settings tab, by default under options, Int 13 unit is selected. DMA was an option, but was not checked. Does anybody know what the difference is between the two? I want to make sure that I'm getting the best performance from my hd.