External HD disconnects itself

Discussion in 'Mac Accessories' started by lazyn, Nov 18, 2014.

  1. lazyn macrumors newbie

    Joined:
    Nov 8, 2012
    #1
    Hi,
    I'm running 10.9.5 on a Mac Book Pro.
    My Seagate OneTouch 4 has been behaving weirdly for the past weeks.
    A few weeks ago, it started to disconnect itself when going to sleep and I couldn't mount it back. I disconnected the USB cable and power cord for a couple of hours and then it was fine.
    After a couple of issues, it was ok for awhile. And now it disconnects itself randomly even when I'm using it e.g. playing music from it. I can disconnect the USB cable and power cord for a couple of hours and then it's fine again. It's been occuring every day for the past three days. Should I be worried?
    PS: I've already backed up everything.
     
  2. ColdCase macrumors 68030

    Joined:
    Feb 10, 2008
    Location:
    NH
    #2
    Dunno about that Seagate model but my 4TB backup plus versions have been solid. I have had similar issues with HGST HGTBDX34 4TB Touro Desk DX3 drives, however. I usually have to pull and replace the power plug for the OS to recognize them, both a 2014 rMBP 10.9.5 and 2008 MacPro 10.6.8.

    I think its just one of those USB quirky things with some "green" drives.
     
  3. Alimar macrumors 6502a

    Alimar

    Joined:
    Sep 17, 2014
    Location:
    New York State
    #3
    With 10.9.5, everyone of my drives would take turns randomly disconnecting. Whether or not they were USB, Thunderbolt or TB/FireWire. When in use or not. Seems to be fine since 10.10 - 10.10.1.
     
  4. vmacrob macrumors newbie

    Joined:
    Jan 8, 2014
    #4
    Have you tried using another cable? I had a drive act similarly a few weeks back, and that did the trick.
     
  5. Mikael H macrumors 6502

    Joined:
    Sep 3, 2014
    #5
    Yep; I'd look into the data cable or the power supply (if applicable).
     
  6. theSeb macrumors 604

    theSeb

    Joined:
    Aug 10, 2010
    Location:
    Poole, England
    #6
    My USB bus powered drives disconnect all the time, usually when the computer goes to sleep, whether they are connected directly, or via a USB hub. I get the "disk was not ejected properly" message about once a day. This behaviour was in Mavericks and I have the same issue in Yosemite.

    I don't have any USB 3 drives with an external power source to check if this happens on them as well.
     
  7. lazyn thread starter macrumors newbie

    Joined:
    Nov 8, 2012
    #7
    Thanks for the replies.
    I'll try another cable and see how it goes.
     
  8. Ray2 macrumors 6502a

    Joined:
    Jul 8, 2014
    #8
    +1. Not to mention with Yosemite we now have FireWire drives not being able to sleep and, at times not being able to eject on shutdown or restart. The latter leaves me with an endless spinner and the need to switch off the drives manually so the Mac's will shut down.

    How Apple could mess up I/O after decades or reliable operation is beyond me.
     
  9. theSeb macrumors 604

    theSeb

    Joined:
    Aug 10, 2010
    Location:
    Poole, England
    #9
    Indeed. This happens with all of my USB 3 bus powered 2.5" drives and I have 5 of them from different manufacturers. Do you have the same issue with USB 3 externally powered drives? I need to expand my backup, but I don't want to get a USB drive, if this happens.

    I have 3 other storage devices:
    1. Lacie 2 Big Thunderbolt
    2. Promise R4 Thunderbolt
    3. G-tech 3 TB connected via the Lacie eSATA thunderbolt hub

    I don't get this issue on the 3 devices connected via TB.
     
  10. Ray2 macrumors 6502a

    Joined:
    Jul 8, 2014
    #10
    Thanks for the input on Thunderbolt. I no longer have any USB 3 drives with external power capability. I returned all but 1 of 5 and keep it (a portable -- no external power port) for travel only. Its seldom plugged in and I simply set my wife's Air to never sleep when its used.

    Good enough for an interim solution until I bite the bullet on my old, no Thunderbolt, Mac's. Probably pick up a portable for my wife's spinner and see how it goes.
     
  11. lazyn thread starter macrumors newbie

    Joined:
    Nov 8, 2012
    #11
    After some testing, it appears the cable was the issue.
    Rookie mistake really. I should have thought of it :rolleyes:
     
  12. theSeb macrumors 604

    theSeb

    Joined:
    Aug 10, 2010
    Location:
    Poole, England
    #12
    Interesting. I'll try the same thing.
     

Share This Page