external HD keeps disconnecting itself. disconnects then reconnects by itself.

Discussion in 'Mac Basics and Help' started by benlangdon, Aug 12, 2009.

  1. macrumors 65832


    Jan 13, 2008
    well thats pretty much it.

    one of my hard drive keeps disconnecting randomly.
    everything is well connected.

    just thought i would throw in some pics.
    as i was seeing what screen shots i should post it disconnected 4 times.

    Attached Files:

  2. macrumors 6502

    Mar 22, 2007
    are we talking usb? is it on a hub? some don't like being on a hub. happened to me that way. direct connection works fine.
    the power supply could be crapping out.

    when it was doing it to me on the hub it also messed up the directories a bit even though it didn't disconnect while any transfers took place. i had to get disk warrior to repair it. disk utility was useless for that.
  3. thread starter macrumors 65832


    Jan 13, 2008
    ya i have 3 external's on usb. i have a direct connect for one of them (the one disconnecting) and the tm drive and another drive on a hub.

    this drive does run 24/7 (seeding for torrents)
  4. macrumors 6502

    Mar 22, 2007
    i guess then if you can hook it up to another mac and see what happens.

    i don't know if all usb ports are all one or separate circuits. but i think they all go down the same pipe, so to speak. so if all your other usb drives are working then its probably not the logic board (or so i was told about my problem) but the drive instead.

    in that case it could be the power or the enclosures controller circuits..or maybe the drive itself.

    i've been having a problem with an ext dvd burner that first started giving me usb power messages, even tho it doesn't run off usb power. then it just would get error when i began burning and disconnect.
    being told it was a power supply or enclosure, i'm on my second new enclosure with the same problem. so now it must be the burner itself (i hope) and so i bought a new 5.25" and see what happens.

    $@#%&# computers <lol>
  5. macrumors G5


    Aug 1, 2004
    St. Louis, MO
    Does this hard drive have an external power source (AC adapter) or is it powered off the USB bus?

    If it's powered off the USB bus, that's likely your problem. See if it came with an AC adapter (or if you can buy one) and try that. The USB bus may not be providing enough power to keep it running.
  6. macrumors regular

    Jun 18, 2005

    I had that problem early on with one of my XTHDs. If I recall, it was just a matter of replacing the USB cable. The one I had just wouldn't stay connected securely. Keep an eye on that, and the power cable as well.
  7. macrumors 6502a


    Jan 17, 2007
    Phoenix, AZ
    I've had experiences with both cable & The need for a direct connect to the computer.
    Try & borrow a friends cable to check it out.
  8. macrumors regular

    Aug 9, 2009
  9. thread starter macrumors 65832


    Jan 13, 2008
    pm me your email
  10. macrumors newbie

    Aug 29, 2009
    External HD disconnecting & reconnecting with firewire.

    I'm finding lots of people have this same problem.

    I connected my new Buffalo Combo 4 External HD to my iMac (OS X 10.4.11). I can transfer data just fine with the USB cable, but when I connect the FW 800 cable or FW 400 cable it works and then will disconnect itself after a few minutes. Then it cycles on and off in shorter cycles giving me the error message that it wasn't properly disconnected. :eek: When I shut it down and reconnect the USB cable I do not have the same problem.

    So to sum it up, the USB cable works just fine. The firewire cables to not. I think it is the Mac, but I wonder if there is a fix for it. Why is it doing this? I bought a HD with firewire so I could use the firewire and it is useless as it is. I've researched this for several hours over the course of a couple of days and I still don't have a solution. I think this has everyone stumped. I wanted to post it anyway just in case there was a solution. Any ideas?

    Thanks for any feedback and I think this site is great!
  11. thread starter macrumors 65832


    Jan 13, 2008
    well i never found a solution, just kinda fixed itself.
  12. macrumors 65816


    Sep 16, 2007
    In my Corner
    this happens if I use the left hand USB port on my 15" last gen MBP...right hand USB usually works except for the occasional hiccup. Both sides used to work fine, just started acting up one night :confused: . Every other device I have still works great w/ both tho.
  13. thread starter macrumors 65832


    Jan 13, 2008
    ha awesome avatar
  14. thread starter macrumors 65832


    Jan 13, 2008
    hey now its happening again but on a different hard drive :confused:
  15. macrumors newbie

    Oct 12, 2010
    ext hd keeps disconnecting

    well it doesn't look like there's really any ready solution to this kind of quirky problem. not really a big deal as long as there isn't REALLY data being lost when it disconnects. do you guys have that problem - of data being erased? i'm very worried cuz i have gotten this problem cropping up recently and i use this ext hd for work stuff.... oh yeah, and do you guys know if it matters if you have your ext hd lying flat or sitting upright? does it make a difference to the inner workings of the beast?

  16. macrumors newbie

    Jun 19, 2011

    Had the same problem today, as soon as HD was doing something, it disconnected. Eventually formatted the disk to a mac-format instead of FAT32. Now works properly. Hope it helps!:)
  17. macrumors newbie


    Jan 23, 2007
    San Francisco
    Have you ever found a solution?
    I actually have this exact issue, and on several macs, but it not always, some times things work just fine on all of them, and then something changes and all macs have the same issue with all Firewire drives.
  18. macrumors 68030

    Dave Braine

    Mar 19, 2008
    Warrington, UK
    We have this problem on a Mini at work, but only when trying to put the Mac to sleep. The drive ejects/disconnects itself(ie the icons disappear form the desktop), the error message shows, and then the drive reconnects.

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