"ivandeaton" > <ivandeaton@y...> wrote: > > Well, You are absolutely WRONG on every point except #3(...yes,96k does > > impeed performance). > > I've had years of experience with this, and what I've found is this... > > 45 tracks on an interanl ATA will playback fine. 90 tracks on > > the internal ATA will stop the system... ie...core audio error > > message. I can take half the 90 > > tracs and put them on the OTHER internal ATA and all 90 playback as > > easy as the single drive playing 45 tracs. Bill I have run this exact test and in my experience it simply does not happen as you are describing. If I reach the ceiling of my system using a single internal SATA drive, and then transfer half the tracks to a different drive, there is absolutely zero improvement in disk performance - many others on this list have also confirmed this. If you are seeing totally different results, then I can only assume you are using a different disk controller or a different system (I am on G5 2x2GHz 5GB Ram). Basically the scenario Stupid8track is describing mirror pretty much exactly what I have seen on our G5. Drive speeds, multiple drives and RAID make absolutely no difference to Disk performance. The only thing I haven't tried is a SCSI RAID configuration, because I wasn't prepared to invest in the additional hardware when nobody (Emagic included) could tell me it would improve performance. Are you running a G5 or G4, and which OS? Maybe Logic yields better results under OS 9 or on G4 hardware (I wouldn't be surprised). Sorry to sound like I'm disagreeing for the sake of it, but I've done a lot of testing on this issue and am concerned when I see results which contradict everything else being found. Personally I'm pretty sure that on G5's (only Mac hardware I have) Logic's poor Disk IO performance is NOT a limit of the disk drives involved. This is further born out by the fact other applications get (in my experience) up to 60% better track counts from the same hardware on the same system. You also get significantly better track counts from older versions of Logic running on older Windows hardware with slower disks. Jules