Thanks for the info, just one question you may be able to help me with.
I have a RAID partition from a Promise PDC20276 chip which works but I'd
like to enable DMA ATA133 on it. It's fstab entry is

/dev/md0 /mnt/raid ext3 noatime,user 0 0

Do I edit /etc/conf.d/hdparm with the lines

hde_args="-d1 -X69"
hdg_args="-d1 -X69"

or do I need to specify md0 ?
Also, is X69 DMA133 or should I use X68 , they are not sata drives just
normal ATA133 drives in raid0.