SATA question
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Thread: SATA question

  1. November 17th, 2007, 01:07 PM #1
    Robert M
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    SATA question

    I was reading about Serial ATA the other day.
    Why did the folks who helped develop the SATA standards think it was necessary to also develop and define a new power connector that carries twelve volts? My understanding is that SATA disk drives operate on 3.3 volts only. Why define a new 15 pin connector that includes 12 volts?
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  2. November 17th, 2007, 01:14 PM #2
    Train
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    The hdd motor requires 12V.
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  3. November 17th, 2007, 01:34 PM #3
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    SuperSparks
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    The Molex connector used on IDE drives also has a 12volt connection for that reason.
    Nick.
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  4. November 17th, 2007, 02:31 PM #4
    Robert M
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    The motor requires 12 volts?
    Ok then I guess that means the circuit board requires 3.3.
    OK, then why the new power connector?

    Isn't 12 volts already available on existing power supplies?
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  6. November 17th, 2007, 02:35 PM #5
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    liam858
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    The 3.3v lines are needed for hotplugging, that is the reason they implemented a new power cable.


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  7. November 17th, 2007, 04:52 PM #6
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    Also, SATA disks can also be used with SAS controllers (Serially Attached SCSI) - power and data connectors fit, they're hot swappable, and SAS controllers kick butt.
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