I am considering a RAID 5 video storage array for primarily read-only use. As I understand it, laptop hard drives use +5v current. Let's assume I am using a modern 65-95w TDP CPU, very low power video card (since it serves video clients and does not need to encode or decode anything), and a non-overclocked MB with a RAID controller and maybe a couple of TV tuner cards. What might I expect the average 2.5" laptop drive to consume when reading (mostly) and writing? I can stagger spinup to minimize inrush current, of course, but I am assuming a 2.5" HD operating is going to draw around .8 amps max or 4 watts during operation. Does that sound about right? I don't need enterprise or SAS grade drives spinning at 10K or 15K, just plain old 5.4K RPM SATA II drives. And for the sake of argument, let's say I am using an OCZ Z850 power supply that can supply +25A on the 5v rail. I'm assuming that the +12v rail is not relevant in the case of a laptop drive, but I don't know what the average modern, non-overclocked motherboard would draw off the +5v rail on its own. And I use OCZ simply because they have a decent reputation and 850 watts overall PSU does not get into the larger dimensions that can cause case fitting issues. Any help would be appreciated, especially in computing the "average" +5v current the motherboard will draw on startup and during operation, so as not to overload the +5v rail overall. Then I can factor in how much the laptop hard drives will draw.