I would definitely stay with FAT 32. There was some early concern that it would be less efficient than FAT16 but I run all my audio drives as FAT32. I don't even do the cluster size special format though I do understand that 32K clusters are probably more efficient for single audio track playback and also for video. However, a heavily loaded system with many tracks playing back at once will fill the HD cache and actually limit performance. For maximum performance I decided to stay with the default 4K cluster size as the HD controller can fetch many tracks worth of clusters and fit them all in cache then go looking for the next set of clusters and fit them in cache while getting the next set of clusters and putting them in cache while loading the first set of clusters out of cache and putting them on the bus. This is the same for SCSI and IDE drives. SCSI AV drives have larger on board caches which is one major reason why they outperform normal SCSI or IDE drives for audio and video. So my 2c worth is use standard FAT32 if you want to do really busy mixes. Ray