Hard drive power usage
I've measured the current draw of various 3.5" disk drives as they power up, on both the 5v and 12v rails. This is a fair indicator of the peak draw of the drives and helps judge power provisioning requirements, for instance when you have a dozen or a few thousand of them all spinning up at the same time.
For a more thorough investigation of a whole-system power usage profile, see http://xymoc.com/supermicro
- Western Digital Caviar Green 2TB.
- Samsung HD103UJ 1 TB, 7200 RPM SATA - 7.4 watts at idle.
- Seagate ST31000340AS Barracuda 7200.11, 1 TB, 7200 RPM SATA - 8.5 watts at idle.
- Western Digital "Green" 1 TB SATA - two samples which behaved differently.
Older batch is red/green, newer batch is blue/purple.
- Hitachi HDS721010KLA330 1 TB SATA - 9.6 watts at idle.
- Western Digital RE2 WD5000YS 500 GB SATA - "Raid Edition", 8.9 watts at idle.
- Hitachi HDS724040KLAT80 400G PATA - 9.0 watts at idle.
- Maxtor Maxline II 320GB PATA - 6.4 watts at idle.