USB 3 External Hard Drives Keep Disconnecting

    As part of the process of upgrading my NAS from one external hard drive to two external hard drives, I reimaged the server with a fresh copy of OMV. The S.M.A.R.T. problem has been resolved, but has since been replaced with a greater problem: I cannot get my USB3 external hard drives to remain connected. For whatever reason, they keep disappearing from the "Physical Disks" list.


    Below are some of the error messages that I have seen while trying to things working. I read online that messages like this suggest that the drive is bad, but considering that I am seeing this on two different USB drives, and the drives work perfectly when I attach it to another computer, I am inclined to believe that I am experiencing an OMV issue. Does anybody have any suggestions?




    Well, there may be more than one reason for that. I had the same problem a while ago with a external USB drive when I tried to copy the content over to my NAS. The external HDD was 2TB and I wasn't able to copy more than about 600-800 GBs then it stalled.
    I went through some steps.


    At first, I checked the BIOS settings and made sure that there is no sort of power-saver setting active for the USB port or the internal hub itself.
    Then I changed the cable to a really good and reliable one.
    None of this helped.


    Finally I found out that the cause of all things ;) was a temperature problem. The USB <-> SATA converter unit in the external enclosure became so hot after a while when I was transfering a heavy load of data over a longer period of time that the circuit board and the chips seam to reach a certain temperature value. Above that temperature level there seemed to occur transmission errors and finally a total breakdown of function. After letting it sit and cool down for one or two quarters of an hour the drive became available again.


    How I fixed the problem: I opened the case and set up a fan that was blowing air directly onto the circuit board and the chips and was able to copy the whole content of 2TBs. After this experience I sold the drive ;)
    Another possible solution would be to remove the drive from the enclosure and connect it to a PC via SATA directly and copy over the content with the OS of the PC. But this depends on the File System of your drive.


    Regards,
    Sven

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