External HDD not recognized anywhere (including Disk Utiliy)

Discussion in 'Mac Basics and Help' started by TijmenDal, Sep 14, 2015.

  1. TijmenDal macrumors member

    Sep 15, 2010

    So I bought a hard drive dock to speed up the back-up workflow. I just unpacked it and it inserted a Seagate HDD 2TB drive I bought along with it. When I insert it, the drive powers up, I hear it spin for 2-3 seconds and then it just powers off again.
    I can't see the disk anywhere on my Macbook (10.9).

    What's going on here? I hardly doubt the HDD dock is broken. There's a green 'power' LED on, as well as a blue LED that supposedly shows you there's a disk inserted. It just doesn't show anywhere on the laptop.

    Thanks in advance!
  2. Ebenezum macrumors 6502a

    Mar 31, 2015
    Open Disk Utility and check if the drive is listed there. If it is select it and check information at the bottom of the window, does it show Mac OS extended and GUID?

    If not you have format it using Disk Utility, choose Mac OS extended (journaled) and GUID. Formatting will erase all data so be careful!

    If the hard drive won't mount at all its probably defective. If you have another dock you could test it, if it works with it then problem is in the dock.
  3. chown33 macrumors 604

    Aug 9, 2009
    Sailing beyond the sunset
    Remember to check the cable, too.

    Also, if you're using a USB hub (I'm assuming the dock is USB), make sure to take that out of the chain, and plug the dock's cable directly into the USB port on the computer.

    It's entirely possible the dock is bad, or the drive is. With no USB cable connected to anything, I think the drive should spin up and remain spinning for considerably more than 3-5 seconds. It might help to identify exactly which dock it is (model number, manufacturer, etc.).
  4. TijmenDal thread starter macrumors member

    Sep 15, 2010
    Thanks for the help.
    I found an old(er) 2.5 750gig drive from an old laptop: same problem, it fires up (but keeps spinning though) but isn't recognized. That drive is working, so it's definitely the dock. I'll send it back.

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