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missing 3.3V sata power, need?

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gionapm

Post subject: missing 3.3V sata power, need?

Posted: August 21st, 2010, 3:27

Joined: August 1st, 2010, 12:05
Posts: 8
Location: san franciso

I have question, why SATA power is 5 pins, but Molex is 4 pins, last that 3.3V need ?

I found my PSU that sata power cable is 5 pins, (5V,12V,3.3V) .
but molex is 4 pins, only(5V, 12V)

I want to use that molex to sata power adapter. missing 3.3V , only 5V and 12V, safe hdd device?

any advice?

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fzabkar

Post subject: Re: missing 3.3V sata power, need?

Posted: August 21st, 2010, 3:58

Joined: September 8th, 2009, 18:21
Posts: 16963
Location: Australia

The SATA standard allows for +3.3V power, but AFAIK, HDD manufacturers use only the +5V and +12V supplies, at least for their 2.5" and 3.5" models. The 3.3V rail, if required, is generated on the PCB by means of a DC-DC converter.

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gionapm

Post subject: Re: missing 3.3V sata power, need?

Posted: August 21st, 2010, 5:26

Joined: August 1st, 2010, 12:05
Posts: 8
Location: san franciso

thanks,
if that hdd device face barcode label, tell us this device need 3.3V?
provide this information?

if missing 3.3V, no any problems?

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fzabkar

Post subject: Re: missing 3.3V sata power, need?

Posted: August 21st, 2010, 5:45

Joined: September 8th, 2009, 18:21
Posts: 16963
Location: Australia

I would think so, but there's always the product manual or other documentation.

Google should find it for you, if you use appropriate filters, eg ...

http://www.google.com/search?q=%225400. ... uctions%22
http://www.google.com/search?q=%22WD10E ... type%3Adoc

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