Travelstar 4K40 4k120 hard disk drives specifications

http://www.hitachigst.com/hdd/support/4k40/4k40.htm

Requirement   +5VDC(±5%)
Startup current (peak, max.) 4.7 W 
Seek (avg.) 2.3 W 
Read (avg.) 2.0 W 
Write (avg.) 2.1 W 
Performance idle (avg.) 1.85 W 
Active idle (avg.) 0.85 W Low power idle (avg.) 0.65 W 
Standby (avg.) 0.25 W 
Sleep 0.1 W

http://www.hitachigst.com/hdd/support/4k120/4k120.htm

Requirement   +5VDC(±5%)
Startup (peak, max.) 4.5W 
Seek 1.7W 
Read (avg.) 1.4W 
Write (avg.) 1.4W 
Performance idle (avg.) 1.25W 
Active idle (avg.) 0.65W 
Low power idle (avg.) 0.45W 
Standby (avg.) 0.15W 
Sleep 0.1W