iMac crashes repeatedly while on external SSD

Discussion in 'iMac' started by CXK, Apr 29, 2018.

  1. CXK macrumors newbie

    Joined:
    Apr 19, 2009
    #1
    I installed Mac OS on a 512gb T3 Samsung external SSD on my wife's 2013 iMac. It sped it up and was great for a while. A couple months ago it would crash randomly, but were now at a point where its crashing several times a day. We are in the process of backing up everything and about to try a fresh install to see if it stops. I fear the drive is dead and I'm sure were just out of the warranty period.

    Does anyone have any tips to fix this? Or experience with running Mac OS on an external SSD?
     
  2. csurfr macrumors 68000

    Joined:
    Dec 7, 2016
    Location:
    Seattle, WA
    #2
    The T3 has a 3 year warranty from Samsung, and from what I’ve read, it was released in January of 2016. You should still be covered, if the drive itself happens to be at fault. You can request an rma on the Samsung website. It’s a bit of a hassle, as you have to fill out a form with all of the information, and then they email you asking for all of the exact same information that you have already given them. You’ll then mail it in and they will send you a replacement drive.

    There are quite a few people here running their machines from that same drive. I had used mine this way for a a few days (I have a 2017 5k w/ the fusion drive), but ultimately went back to the stock config.

    Edit: here is the link to the Samsung support page for the T3. You can request a warranty replacement here (scroll down to repairs and service on the right side):

    https://www.samsung.com/us/support/owners/product/portable-t3-ssd-250gb-2tb#warranty
     
  3. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #3
    Have you tried a different USB3 port on the back of the iMac?

    Have you gone to the energy saver pref pane and set computer sleep to "never"?
    (display sleep can be set wherever you wish)

    Have you gone to the energy saver pref pane and UNCHECKED "put hard disks to sleep when possible" and "enable power nap"? (if you have those options)
     
  4. CXK thread starter macrumors newbie

    Joined:
    Apr 19, 2009
    #4
    I didnt know that, I assumed it was a 1 year. Thanks!
    --- Post Merged, Apr 30, 2018 ---
    I tried different ports. The iMac was set to "Prevent computer from sleeping automatically when the display is off". I can't remember if Powernap was checked or not. We have restored and set it up as a new computer. So far, no issues other than once when I woke it up, we just got stuck with the beach ball spinning and I had to shut it off.

    While running the OS from an SSD, should I not allow the computer to sleep or use power nap ever?
     
  5. Fishrrman macrumors P6

    Fishrrman

    Joined:
    Feb 20, 2009
    #5
    "While running the OS from an SSD, should I not allow the computer to sleep or use power nap ever?"

    My recommendation is that you turn both of those off.
    Then, see if the problems you were having just... disappear...
     
  6. CXK thread starter macrumors newbie

    Joined:
    Apr 19, 2009
    #6
    It crashed again, while my wife was working in Final Cut Pro. Theres really no pattern, its never one application that it happens consistently with. I think I'm going to buy another SSD and see if it stops. If that doesnt fix it, I guess I'll be heading to the Genius Bar.
     
  7. alien3dx macrumors 6502a

    alien3dx

    Joined:
    Feb 12, 2017
    #7
    you on the icloud thing? I'm disable it. As me,the library i put in the internal disk instead of ssd. 256 GB to small for apps.
     
  8. CXK thread starter macrumors newbie

    Joined:
    Apr 19, 2009
    #8
    We dont use iCloud for storing files. I guess my next step is to restore to the internal disk while I wait for Samsung to warranty the SSD or just buy a new SSD to avoid waiting forever. If it still does it after that, I assume the next step is visit Apple. It should be interesting to see what they can do to fix it, hopefully its not a RAM issue or my motherboard going out.
     
  9. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #9
    Can you better define "crash" for us? Is it an application (or multiple applications), is it a freeze, or is it a kernel panic?
    Have you looked through any log files to see if any information might be there?
     
  10. CXK, May 1, 2018
    Last edited: May 1, 2018

    CXK thread starter macrumors newbie

    Joined:
    Apr 19, 2009
    #10
    The screen suddenly goes black, then the message saying "Your computer restarted because of a problem" and it reboots. I'm not sure where to look for the logs. Edit: I just found the logs, but since we've set it up as a new install theres only one Kernel panic log. I set up an appointment with the genius bar for now.
     
  11. alien3dx macrumors 6502a

    alien3dx

    Joined:
    Feb 12, 2017
    #11
    i got few ssd from 2010.. but still undead yet.. It is possible just to remove all other usb connected ? I'm just scare share bandwidth issue..
     
  12. CXK thread starter macrumors newbie

    Joined:
    Apr 19, 2009
    #12
    The only other thing plugged in was the Apple keyboard.
     
  13. chrfr macrumors 604

    Joined:
    Jul 11, 2009
    #13
    Does the computer run properly from the internal disk? I suspect that Apple will be reluctant to troubleshoot running from an external drive without knowing how the computer behaves when running in a completely stock configuration.
    You could post the kernel panic logs here. They may be useful to review.
     
  14. EugW, May 2, 2018
    Last edited: May 2, 2018

    EugW macrumors 603

    EugW

    Joined:
    Jun 18, 2017
    #14
    I had the exact same problem with a FireWire 800 2.5" SSD, running off FireWire power (which is much, much more than USB power). It'd work great and then out of the blue, the computer would get the spinning beachball of death and couldn't recover from that. There was no consistency in the pattern. It could be at any time, and in any application. However, between crashes it would run perfectly fine, for many, many hours continuously.

    I then plugged in the FW enclosure into AC power and it worked perfectly after that. Ran it for over a year like that with no crashing issues.

    In my case it was absolutely clear that despite the fact that FW can provide quite a bit of bus power, the reliability and/or amount of that power still just wasn't good enough to run that drive + enclosure reliably. While the Samsung T3 is built to run off USB power, there is a possibility in your case it just doesn't. USB power is way less and is pretty borderline for a drive. and the stability of the power may also be an issue. I've recommended in the past to people, ideally if you want an SSD boot drive, having an external power supply takes this potential problem out of the equation.

    EDIT:

    Here we go. Bus power usage on that drive can spike to well above 3 Watts:

    https://www.anandtech.com/show/1016...mption-measurement-using-plugables-usbctkey/3

    [​IMG]

    This can be a problem in some situations, since under usual circumstances, USB 2.0 power should only provide 2.5 Watts (5 V x 0.5 Amps). USB 3 power can be 4.5 Watts though (5 V and 0.9 Amps) and your 2013 is USB 3, but still I have to wonder if this could be a problem.

    tl;dr:

    My bus powered FireWire 800 SSD gave similar results and would crash randomly, but all the crashes disappeared when I added supplemental power.

    For the Samsung T3, its power usage can spike to well above 3 watts, which would be a huge problem for USB 2.0 ports. It should work on USB 3.0 ports, but I still wonder if in some cases it might be a problem with specific hardware, especially since USB power may not always be completely stable.
     
  15. alien3dx macrumors 6502a

    alien3dx

    Joined:
    Feb 12, 2017
    #15
    long time no see bulk hardisk external with external power. I'm kinda scare also after read the single usbc in macbook pro fiasco. https://discussions.apple.com/thread/8223635.

    Thank god i choose imac
     
  16. EugW macrumors 603

    EugW

    Joined:
    Jun 18, 2017
    #16
    Wow, that’s scary, 20V out of that MPB USB-C port.
     

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