When I put hw.ata.atapi_dma="1" in /boot/loader.conf and reboot, I'm
still stuck in PIO4.  What am I doing wrong?

The drives probably don't support any UDMA modes. WDMA modes aren't enabled for atapi devices because there's a very large number of devices which don't implement them right or not at all, yet claim to support them.

That was it.  The drives only support WDMA modes.  Thanks!

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