Is it normal for SSDs to use the same or more power as a HD? SSD An OWC Mercury Exreme Pro 40GB SSD uses 2.2W-2.5W when active. A WD SiliconEdge Blue 64GB SSD uses 2W when reading and 3.5W when writing. An OCZ VERTEX 2 40GB SSD uses 2W when in operation. HD A WD Scorpio Blue (5400rpm, 2.5") 250GB HD uses 2.5W when writing/reading. A WD Scorpio Black (7200rpm, 2.5") 250GB HD uses 2.5W when writing/reading. A Hitachi Travelstar 5K750 (5400rpm, 2.5") 500GB HD uses 1.4W when writing/reading.