If this is the wrong news group to post this to, I apologize. Just tell me to which news group I should post. MY system: PC100 Super Socket 7 made by Hsing Tech Enterprise (subsidiary of PC Chips) AMD k6-2 running at 500MH 64 M ram 10 G Seagate hard disk dual boot Linux Mandrake 7.0 & windoze 98 Now my question: The BIOS has an option 'Ultra DMA Support'. If I enable this option, I can see no difference in windoze. If I enable this option, I can see no difference in Linux UNLESS I use hdparm. With it disabled, I can use 'hdparm -c1-d1 /dev/hda' and change the 64M read timing from 22 sec down to 10 sec. With it enabled, I can not use the -d1 option of hdparm. It gives me errors such as: hda: dma_intr: Error 0x51 drive ready seek complete error hda: dma_intr: Error 0x84 drive status error bad CRC. Yes I know. If it feels good do it. If it hurts stop. But what is the BIOS option 'Ultra DMA Support' used for. I have tried several hdparm settings but can find nothing that makes use of it. The hdparm settings I have tried are: 'hdparm -c1-d1X66 /dev/hda' Thanks for any info. Charles
