USB v/s SATA (voltage)

what is the difference in the voltage drawn in case of a USB CD/DVD writer compared to a SATA II connected CD/DVD writer.?

how much difference is there between the drawn voltage by USB and SATA II individually?
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More about sata voltage
  1. USB can provide 5V to an attached device.

    Sata data cables provides no power to attached devices. This is why a Sata device has a second cable to provide power. The power cable provides 12V, 5V, and 3.3V.

    These are constant and do not change depending on the device attached.

    Now, current draw (and therefore wattage) change depending on the device, but that can be read from the device spec sheet.
  2. nordlead said:
    USB can provide 5V to an attached device.

    Sata data cables provides no power to attached devices. This is why a Sata device has a second cable to provide power. The power cable provides 12V, 5V, and 3.3V.

    These are constant and do not change depending on the device attached.

    Now, current draw (and therefore wattage) change depending on the device, but that can be read from the device spec sheet.



    ok

    how much voltage will a SATA Optical Drive like this one requires ?

    Asus DRW

  3. Do you understand the differences between volts, amps, and watts?

    Like I said, SATA power connectors provide 12V, 5V & 3.3V, so any device must use a subset of those voltages. That model uses 12V & 5V.
  4. Woah, if you are trying to run an internal drive through USB power you should think again.
    USB is 5V only, and is very limited in the amperage they can provide per hub. They make products which allow you to have a SATA to USB adapter with a separate power chord like this one that I use (though I found mine on clearance for $5 (score!):
    http://www.newegg.com/Product/Product.aspx?Item=N82E16812232002
  5. I don't know what he is trying to do. You can power internal devices with USB, but you'd have to combine multiple USB ports to get enough power. I know a lot of external HDDs now use 2 USB ports to provide up to 9W of power.
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