Ao que parece não basta activar o DMA no gestor de dispositivos para as drives e discos rígidos funcionarem em modo DMA ora leiam: Checking your DMA settings. Came across this. When you enable DMA by using the Device Manager and ticking the DMA box it might not always be enabled. One way to check is to open a Windows file, "Mshdc.inf" found in Program Files/Windows/INF and look down that file for a header called "ESDI_AddReg". It should look apparently like: ESDI_AddReg HKR,,DriverDesc,,"ESDI Port Driver" HKR,,DevLoader,,*IOS HKR,,PortDriver,,ESDI_506.pdr HKR,,IDEDMADrive0,3,01 HKR,,IDEDMADrive1,3,01 Apparently if the last two lines are shown (with the other 3) you are set. If not, add the last two lines. Then you have to remove all your IDE devices from the Device Manager. The system will tell you to reboot (ours did not) and when restarting will re-detect the controllers and set the drives up in DMA mode. We found that our file did not have the last two lines. We tried it, it works, but then we already have our Hard drives set for DMA mode anyway. We found by searching through the registry, before we tried it, that we found a section that said we were setup for DMA mode. Link para a fonte do artigo Será que é verdade ?? Eu fui verificar o ficheiro "Mshdc.inf" e realmente não tenho as últimas duas linhas mas não tive coragem de experimentar o fix que eles propõem neste artigo por isso gostava de saber a vossa opinião.