Power Management (watts)
Seek : 12.4
Read/Write : 12.8
Idle : 7.2
Standby : 1.4
Max power is much higher than power after spinup to nominal RPMs. It won't use that max power for even a quarter of a second.
the image below is from a seagate document about a server class scsi hard drive but the image conveys an important concept or two.
Note the power spike is almost totally gone well before the drive is considered fully "ready" for normal use stats. The drive will attempt to execute commands asap, they just don't guarantee it will do so in x seconds.
for comparison 640GB modern drives from WD
640GB Black Blue Green
Drive Ready Time 11 sec 13 14.3
R/W Power watts 8.3 8.3 5.4
Idle Power watts 7.7 7.7 2.5
Standby watts 1 1 0.46
Sleep 1 1 0.46
There is no reason to go to laptop drives with the Greenpower drives having so much better price per GB and still being low power and reasonably quiet.
But hey really the Seagates you have aren't that terribly bad in the power department if they are reading or writing. It's only the idle power draw that a "green" drive really shines vs the old drives you have.
http://www.silentpcreview.com/forums/vi ... ht=#435261
has the full post on those 640GB drives.