I have to concur that the new probe messages are confusing.  They even
confused me until I looked at the code.  It's really ambiguous what
it's actually doing.

I'd suggest a few things:

1) Always print a message indicating whether or not the controller
   supports DMA.

2) Change:

wd0: PIO mode 4, DMA mode 2

to:

wd0: drive supports ...

3) Change this message:

wd0: using 32-sector pio transfers, lba mode

to:

wd0: using [N]-sector transfers, {LBA,CHS} addressing, {PIO,DMA,UDMA} mode [N]

and put it at the end of the probe.