Question : Problem: Hard Disk current consumption / wattage

Regarding the wattage of PC Power Supplies, what what is the approximate extra wattage that would be used when adding two additional SATA hard drives and a extra fan.

NOTE: I am using a 230V mains supply.

Answer : Problem: Hard Disk current consumption / wattage

Two SATA drives approx 18W (2x9W)
Standard 80mm case fan approx 1.5W

Please note that these are extremely approximate and will vary with size of hard drive, manufacturer, throughput and all sorts of other stuff.