The hard disk is not set to DMA or U-DMA mode.Newer IDE drives provide the fast Ultra-DMA-mode capability.This mode may be jumpered on the hard disk itself or controlled by a configuration utility shipped with the hardware. The standard configuration is (up to now) the U-DMA-33 mode, as the U-DMA capability's also related to the mainboards IDE controller.Especially Seagate drives need a specific utility to be modified (there aren't any jumpers on the rear of the HD to change the DMA mode).The utility can be downloaded from Seagates website: www.seagate.com the ULTRA ATA CONFIGURATION UTILITY to download the program.Double-click on the file to start it and set the UDMA 66 mode.This utility can be also used to switch the HD back to the standard mode when it should be used on older CPU's.