External HDD not being detected

Discussion in 'MacBook Pro' started by dacoolest, Mar 1, 2012.

  1. dacoolest macrumors regular

    Joined:
    Nov 11, 2011
    #1
    I have an external HDD that has two usb connections for power and data. most of the time my macbook pro doesn't detect it and I have to keep unplugging and plugging into different usb ports and then it gets detected after a while. I tried the same HDD with a windows desktop and it worked well.

    Is this because HDD not getting enough power ? Are all usb ports the same when it come to power? any ideas to get this working?

    Thanks.
     
  2. heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #2
    what mac do you have are all the ports 2.0?

    is this a portable or desktop external

    does it require 2 usbs to make it work?
     
  3. dacoolest thread starter macrumors regular

    Joined:
    Nov 11, 2011
    #3

    my computer is a macbook pro 17 late 2011. Its a portable hdd. the usb cable is decided into to parts ( has two connectors) and one is marked as power and the other one as I/O. With the desktop I tried, even it worked only when the I/O usb jack is plugged in.

    when I plug the power usb connector, I can feel the disk spinning in it. And it goes off as soon as I plug in the I/O connector.

    But still works occasionally though.
     
  4. heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #4
    odd since you mac is new that eliminates any chance your usb is 1.0

    is your computer full charged, maybe its something silly like your battery is 2 low to power it on?
     
  5. dacoolest thread starter macrumors regular

    Joined:
    Nov 11, 2011
    #5
    Yes it is fully charged now. I just tried plugging it to my brother's laptop and still the result is same. It seems to be only work well when connected with a desktop :S
     
  6. heisenberg123 macrumors 603

    heisenberg123

    Joined:
    Oct 31, 2010
    Location:
    Hamilton, Ontario
    #6

    im no usb expert so this might be way off but if the drive is usb 3.0, would it mean its 100% compatible for 2.0?
     
  7. dacoolest thread starter macrumors regular

    Joined:
    Nov 11, 2011
    #7
    I bought this HDD a long time ago when those portable HDDs were super expensive. Perhaps this requires a more power than newer ones and I should consider buying a new external HDD.
     
  8. poorracerkid macrumors member

    Joined:
    Nov 4, 2010
    Location:
    Galvatraz, TX
    #8
    Every time this has happened it's been the drive dying. Try to get your stuff off of it.
     
  9. iMacDragon macrumors 65816

    iMacDragon

    Joined:
    Oct 18, 2008
    Location:
    UK
    #9
    Is this with the laptop plugged in or running off battery?

    if off battery, only one of the usb ports will give full power, and a drive requiring two full powered ports might well not work.
     

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