When I play an audio CD, the sound playback is choppy – whats wrong?
A. The Apple CD/DVD driver only supports CD-DA on ATAPI drives. We believe the reason for this is two-fold: First, all Apple computers which shipped with an internal ATAPI CD or DVD drive are capable of sustaining CD-DA playback (a new way of performing audio playback). This is not true of Apple and other third party SCSI CD-ROM drives. In any case, our 5.5 and higher CD/DVD SpeedTools versions will allow CD-DA playback on almost all ATAPI AND SCSI CD/DVD devices. However, there are some compatibility issues especially with SCSI CD/DVD devices which need to be mentioned here. First, we have noted choppy playback on drives connected to the Adaptec 2906 PCI SCSI host adapter card. This has to do with the way data is transferred through this particular card, and cannot be addressed by our driver (we’ve tried). On the other hand, the Adaptec 2940/3940 series cards we tested seemed to work well. Unfortunately, we are unable to test every possible SCSI drive on every PowerMac with every SCSI
