My computer's motherboard is the flagship 638B motherboard, which uses VIA's VT82C693 and VT82C596A chipset. When the settings related to the hard disk type in the BIOS are selected for Auto, the maximum transfer mode that is really supported by the hard disk and optical drive is displayed in the startup screen, and the UDMA 4 mode that does not support itself can even be displayed.
For hard drives supporting the DMA33 transmission mode, they can be set to DMA mode after entering Windows 98. The specific steps are: Right-click "My Computer", select "Properties", select Device Management, expand the number in front of "CDROM" and "Disk Drive", double-click the subpower representing the drive and hard disk, then select Settings, select the DMA option. When selected, a warning that does not support hardware is selected, which is a normal prompt, and restarted with trimming. In addition, if the hard disk supports DMA66, the DMA option cannot be selected; even if it is untrusted, it will not be effective, but the computer will have a long time automatic correction waiting.
If you want to use the DMA66 hard disk DMA transfer feature on the motherboard that supports only DMA33, it is widely believed that a PCI hard disk acceleration card must be used, or the DMA 66 of the hard disk is converted to DMA33 with the DMA conversion program provided by each hard drive. However, after repeated trial, there is still a very simple method.
Turn the UDMA option in the motherboard from the default auto to disable, shield the motherboard to the UDMA support for the hard disk, after entering Windows 98, you can use the method described above, using the UDMA driver that comes with Windows 98, Let the hard drive work in DMA33 mode. After this method, the second hard disk IBM15.2G hard disk is working properly in DMA33 mode. After winbench99 test, the hard disk transfer is raised from the original 4.8m / s to 11.2m / s, CPU usage From 96% to 5.3%, almost 6.8m / s of 6.4g of DMA33 Fire Sixth Generation 6.4G is 12.8m / s, and the CPU usage is 6.3%.
