On Tue, 24 Jan 2006, Francois Barre wrote:
So my (real) question would be :
- how much a drive consumes ? how long can it be on diet ?
and, on top of this :
Is it possible to make the drives turn slower ? To make the heads move
slower ? That would be my dream. No more heat, a 10mA consumption, no
more noise...
Some manufacturers do produce documentation regarding this:
http://www.hitachigst.com/tech/techlib.nsf/products/Deskstar_7K250
It is the "Specification - OEM" document[s] that are interesting, in my
case lately: "Deskstar 7K250 Specification v1.6 (Serial ATA)"
On page 27 you have "Table 21: Power supply of current models" where you
can read the power consumption of a drive during various kinds of load
(startup, idle, random r/w, sleep).
Here you also can see that the "Silent" mode makes the drive use 8.5W
instead of 10.6W under "Random R/W Average" load. Not that I know how to
activate "Silent" mode from Linux, but I expect the document to tell you
what bits you should send over the cable.
I suspect other manufacturers have similar documents, but I don't know if
they are public or how to find them. Some pointing and clicking on
websites will probably tell you what you need for your drives.
/Mattias Wadenstein
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