I currently have four 1TB Samsung F3s internally in RAID10 configuration, for a 2TB volume. Has worked great so far. Thinking about replacing all four drives with hitachi's 4TB internal drives, using the same software RAID10 configuration for an 8TB volume. Any reason why I shouldn't do this? For some reason the thought of four such densely packed drives internally makes me nervous. As it is I get a resonance hum with my existing drives which can't be ignored but I've learnt to live with. Advice would be much appreciated! Edit: I should add that my boot disk is a separate SSD connected instead of the secondary optical drive. That'll obviously stay as it is.