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ahh

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Since: Dec 03, 2003
Posts: 4



(Msg. 1) Posted: Thu Dec 04, 2003 1:22 am
Post subject: What about watts with SATA?
Archived from groups: comp>sys>ibm>pc>hardware>storage (more info?)
They always mention SATA needs less volts than parallel ATA drives. Isn't
this irrelevant unless you say they need less watts? What are the watts of
SATA drives compared to ATA?

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Pinko_Commie

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Since: Dec 03, 2003
Posts: 1



(Msg. 2) Posted: Thu Dec 04, 2003 1:22 am
Post subject: Re: What about watts with SATA? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
"ahh" <ahh.TakeThisOut@ahh.com> wrote in message
news:Q4WdnXC_JuZcbFCiRVn-iw@giganews.com...
 > They always mention SATA needs less volts than parallel ATA drives. Isn't
 > this irrelevant unless you say they need less watts? What are the watts
of
 > SATA drives compared to ATA?

Not sure what you're trying to say here.

WATTS are just a unit of work, you calculate by multiplying the voltage
that the drives run on by the amount of current (AMPS) that they draw.

Also, they will run on a standard voltage, they use 12volts and 5volts as
this is what a PC power supply supplies, so if anything it would be drawing
less AMPS.

But, having just checked the Western Digital site to do a (pretty much) like
for like comparrison between a 250GB IDE and a 250GB SATA, the SATA drive
draws slightly more power.

=============
WD2500JB - 250GB 7200rpm 8mb cache IDE

12 VDC
Read/Write 430 mA
Idle 400 mA
Standby 20 mA
Sleep 20 mA

5 VDC
Read/Write 730 mA
Idle 680 mA
Standby 190 mA
Sleep 85 mA

Power Dissipation
Read/Write 8.8 Watts
Idle 8.3 Watts
Standby 1.2 Watts
Sleep 0.7 Watts
=============
WD2500JD - 250GB 7200rpm 8mb cache SATA

12 VDC
Read/Write 450 mA
Idle 470 mA
Standby 23 mA
Sleep 23 mA

5 VDC
Read/Write 800 mA
Idle 750 mA
Standby 330 mA
Sleep 200 mA

Current Requirements
Power Dissipation
Read/Write 12.8 Watts
Idle 9.5 Watts
Standby 1.9 Watts
Sleep 1.3 Watts




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J.Clarke1

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Since: Nov 27, 2003
Posts: 93



(Msg. 3) Posted: Thu Dec 04, 2003 1:22 am
Post subject: Re: What about watts with SATA? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On Wed, 3 Dec 2003 22:22:48 +0800
"ahh" <ahh RemoveThis @ahh.com> wrote:

 > They always mention SATA needs less volts than parallel ATA drives.
 > Isn't this irrelevant unless you say they need less watts? What are
 > the watts of SATA drives compared to ATA?

The mechanical parts are the same in most cases, the motors are the same
in most cases, so the power consumption will be the same in most cases.

--
--
--John
Reply to jclarke at ae tee tee global dot net
(was jclarke at eye bee em dot net)<!-- ~MESSAGE_AFTER~ -->
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Arno Wagner

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Since: Nov 07, 2003
Posts: 2178



(Msg. 4) Posted: Thu Dec 04, 2003 4:05 am
Post subject: Re: What about watts with SATA? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Previously ahh <ahh.TakeThisOut@ahh.com> wrote:
 > They always mention SATA needs less volts than parallel ATA drives. Isn't
 > this irrelevant unless you say they need less watts? What are the watts of
 > SATA drives compared to ATA?

They are talking about the signaling, not the power consumpltion.
Power consumption is the same as for ATA disks.

ATA 0V...5V for the signalling.
SATA uses 0V...0.25V for signalling.

One reason is that the current chip processes already
have trouble with high voltages like 5V. If you use
5V signalling you need extra buffers on the chip.
With .25V sinalling you get less noise immunity,
but doing it differentially (i.e. using two lines,
one that hat the inverse signal of the other and then
only measuring the difference at that target) you can
overcome this problem.

You can get the spec here:

<a style='text-decoration: underline;' href="http://www.serialata.org/collateral/zipdownloads/serialata10a.ZIP" target="_blank">http://www.serialata.org/collateral/zipdownloads/serialata10a.ZIP</a>

Chapter 6 explains all the physical stuff.

Since SATA uses 0...250mV with 100R termination, you have
at most 625 uW (that is micro-Watt) per interface line Wink

Arno
--
For email address: lastname AT tik DOT ee DOT ethz DOT ch
GnuPG: ID:1E25338F FP:0C30 5782 9D93 F785 E79C 0296 797F 6B50 1E25 338F
"The more corrupt the state, the more numerous the laws" - Tacitus<!-- ~MESSAGE_AFTER~ -->
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Rod Speed

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Since: Nov 09, 2003
Posts: 2385



(Msg. 5) Posted: Thu Dec 04, 2003 7:48 am
Post subject: Re: What about watts with SATA? [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
ahh <ahh DeleteThis @ahh.com> wrote in message
news:Q4WdnXC_JuZcbFCiRVn-iw@giganews.com...

 > They always mention SATA needs less volts than parallel ATA drives.

Thats just plain wrong.

 > Isn't this irrelevant unless you say they need less watts?

Yes, particularly when the original statement is just plain wrong.

 > What are the watts of SATA drives compared to ATA?

Nothing in it with drives available in both versions.<!-- ~MESSAGE_AFTER~ -->
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