So the driver is either 'malfunctioning' or it's broken...do you know what revision firmware the drive is using? Your disk authoring software may tell you this. The latest version is 1.22 which you can get by Googling PIONEER DVD-RW DVR-112D firmware. Or go to the Pioneer website. I do not know how to upgrade the firmware for the recorder in MAC Land, in PC Land the firmware update is a simple executable file.
If you are running this version you can try to reflash it. Have you tried another brand of DVD disc? Some discs are less compatible than others. Try another brand of DVD
http://www.pioneerelectronics.com/pio/pe/images/portal/cit_3424/426554181POV_DVR-112D.pdf
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