5400 vs 7200rpm HD external enclosure power requirements?

Discussion in 'Mac Accessories' started by sprime1, May 4, 2011.

  1. sprime1 macrumors member

    Joined:
    Aug 30, 2007
    #1
    I'm looking at purchasing a 2.5" hard drive and an external enclosure. The main feature i want is not having to use an AC adapter or a second USB port to power the drive.

    Is there any evidence or research done to tell us, say that 5400 vs 7200rpm hard-drives require less power, so they don't need a secondary power supply?

    For example, most 2.5" external hard-drives, like the WD Passport series, only require the 1 USB connection for power and data. How do i mimic this single USB connection with a bare-bone 2.5" drive and an aftermarket 2.5" enclosure??

    Much Thanks!!
     
  2. cube macrumors G5

    Joined:
    May 10, 2004
  3. cluthz macrumors 68040

    cluthz

    Joined:
    Jun 15, 2004
    Location:
    Norway
    #3
    If you are going the USB2.0 route there will be no benefits with 7200RPM over 5400RPM.
     
  4. cube macrumors G5

    Joined:
    May 10, 2004
    #4
    I can power the Momentus XT in the OWC AL mini from FireWire.
     
  5. sprime1 thread starter macrumors member

    Joined:
    Aug 30, 2007
    #5
    Firewire is not an option for me unfortunately. The main purpose of this new drive is to plug it into the USB port on my TV to watch movies. I currently have a 500gb WD Passport harddrive that is full, and requires no secondary power source. I'm looking to replicate this.
     
  6. cluthz macrumors 68040

    cluthz

    Joined:
    Jun 15, 2004
    Location:
    Norway
    #6
    The controller from my two year old WD Passport (was a 320GB) can power a Seagate Momentus XT.
    I put mine in the enclosure when I transfered users from the internal HD on my MBP.
    How much power the aftermarket enclosure provides should be about the same I guess and the WD Passport had a 320GB Scorpio Blue.

    No guarantees but I guess it should work the same way.
     

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