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The FreeBSD cdrtools (To which BashBurn is a front-end) port supports
SCSI drives only. If you have an ATA CD/DVD drive, use them through
the cam system. See Chapter 12.5.9 of the handbook:

http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/creating-cds.html#ATAPICAM

ATA devices have to be accessed through their atapicam device, i.e.
/dev/cd0 instead of /dev/acd0.

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