The answer - no.It turns out that super duper disk I/O throughput is not really a major factor (after a point) for Pro Tools. In fact, you may actually experience more problems and unwanted side effects from ATA/100 or Ultra/160 SCSI disk subsystems. What are these side effects? Some ATA/100 or high-speed SCSI controllers have drivers that hog too much CPU bandwidth or PCI bandwidth (holding off interrupts for too long, or dominating the PCI bus). When this happens, you may experience -9092, -9093, -9128, or -6042 errors when using Pro Tools.This is why we recommend that users of SCSI systems "throttle back" their SCSI controller (like via the SCSI BIOS with Adaptec controllers) to 20 MB/sec instead of 40, 80, or 160 MB/sec (the most common defaults). Higher values may cause the SCSI PCI card to generate too much PCI traffic, and you don't really need that much disk I/O bandwidth anyway (as explained above). We recommend 20 MB/sec for SCSI systems to give a bit of "headroom" when there is disk fragmentation and/or a lot of dense edits within the Pro Tools session.ATA/100 systems can work, but we've seen evidence of poorly written drivers that don't work as well as ATA/66 or ATA/33 systems. For instance, it's known that the currently shipping drivers from VIA for the VIA 686B South Bridge (on many new motherboards) have performance problems under Windows 2000. Fortunately, the problems don't exist under Windows 98SE or Windows NT, so Pro Tools users are currently immune to this specific problem. However, we have seen reports of bad performance with ATA/100 drivers even under Windows 98 (different but related performance issues). Over time these driver issues will probably be resolved, but it just goes to show that "faster" is not always better.