CDROMs/DVD ROMs using Parallel ATA to SATA converter.

Hi ,
I have a scsi miniport driver that supports ATAPI devices and works
fine for PARALLEL ATA controllers. On Parallel ATA converters i was able to
do a UDMA mode transfers to/from the ATAPI devices. Problems come when i try
to use the PATA-to-SATA converter.Here I see that UDMA transfer is not going
through but the PIO does.

Is there something i am missing or something that needs to be done specially
for these PATA-to-SATA bridge chips??

Any help is highly appriciated.
Thanks,
Ajitabh