quintaq@yahoo.co.uk wrote:
> I have an IBM DTLA 307030 (ATA 100 / UDMA 5) on an 815e board (Asus CUSL2), which has a PIIX4 controller.
> ...
> My problem is that (according to hdparm -t), I never get a better transfer rate than approximately 15.8 Mb/sec.  I achieve this when DMA is enabled, - without it I fall back to about 5 Mb /sec.  No amount of fiddling with other hdparm settings makes any difference.
> ...

15MB/s for hdparm is about right.

"...four IDE devices can be supported in Bus Master mode.
 PIIX4 contains support for "Ultra DMA/33" synchronous DMA
 compatible devices."

http://developer.intel.com/design/intarch/techinfo/440BX/PIIX4_intro.htm

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