The "driver" doing the driving appears to be related to Apple's own bundled disk formatting tools, as an IDE drive used with the Sonnet cards has to be formatted with the Apple utility. That IDE drive subsequently shows up in the System Profiler as a SCSI drive. The drive then can't be used except with the card (unless reformatted again). Actually, I think the card even shows up in the System Profiler as a SCSI card. Go figure.

BUT, it works reliably and well. I have been running a couple of them for years.