1.    2 Weeks Ago #1
    Join Date : Oct 2016
    Posts : 3
    Windows 10

    USB 3 external HDD Detected but inaccessible-Post Anniverssary update

    Hi All,

    First thread on these forums but noted a few posts with similar but not quite the same symptoms.

    I have a 1TB Seagate external USB3 HDD (not an ssd just a normal spinner). On two Win 10 devices I am now unable to access the contained data after the anniversary update, whereas I was able to before.

    Specifically the Device receives power (gets its little blue LED lit up), windows detects the device in Devices and Printers and in Device Manager and Disk Manager. Seems promising so far right?

    My Computer shows absolutely nothing relating to the drive, and it used to map to either G or E depending on which of my devices I used. I do not use any virtual drives and it is currently my only usb storage device of any kind.

    Brief history on what I've tried so far:
    Reboot machine with drive inserted, and left out - no change
    Allow windows troubleshooting: drivers appear up to date and nothing specifically shows amiss or with a warning ! in device manager.
    Using diskpart in an elevated cmd prompt you can start to see the issue:
    Click image for larger version. 

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    which Disk manager agrees with. That being said I am unable to specify any options on the sole partition on this drive except for "delete volume" and "Help", the rest are greyed out, but the two unallocated spaces have everything available I would expect to see. (yes I play Spore - pls don't judge)
    Click image for larger version. 

Name:	diskman 1.JPG 
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    I am unable to create a volume in diskpart as the selected disk is not dynamic. I can specify the disk as dynamic, but unsure as to the consequences of any data residing on the drive currently. While its not end-of-the-world stuff if I have to format and start over I would ideally like to keep said data intact if possible.

    I have checked the HKLM registry for upper and lower keys but couldn't not find anything within. done a numerous reboots and checked front vs rear usb ports (2 and 3). I've added the option to see hidden items in Device Manager and can see lots of volumes that are greyed out but I am unable to remove them (the option is there it just does nothing).

    Hoping a bright spark on these forums can suggest some things to try and get this working. I am unsure if the Upgrade to anniversary is the cause (as the config of the drive looks pretty funky anyway).

    Many Thanks,
      My System SpecsSystem Spec

  2.    1 Week Ago #2
    Join Date : Oct 2016
    Posts : 3
    Windows 10

    Hi Sorry for the shameless bump, but would like to have an answer here, haven't found an answer online yet and it's doing my nut in!
      My System SpecsSystem Spec

  3.    1 Week Ago #3
    Join Date : Jun 2016
    Los Angeles
    Posts : 246
    Windows 10 Pro

    the partition you are selecting is already created and is set as Primary, so you cannot create a volume out of it because it is already a volume/partition. However it doesn't have a drive letter and may not be formatted.
    First try a third party utility like Find and Mount or Partition Manager.
    If you are trying to recover data, use the free Test Disk program. You will need another drive of the same size or larger to restore your files.
    If you just want to regain the drive again, delete the partition and create a New Simple Volume, and Format it NTFS
      My System SpecsSystem Spec

  4.    1 Week Ago #4
    Join Date : Oct 2016
    Posts : 3
    Windows 10

    Thank you Spunk, I am trying Partition wizard at the moment, and will try Test Disk if that does not prove successful.

    What I am also hoping to understand is what has physically gone wrong, while the symptoms are clear enough for anyone with half a sense for ICT issues, I am not really seeing what the root cause is.

    Is this for example due to physical damage on the drive, a software corruption within the partition table or some other "soft" damage I have caused to due to poor practice and maintenance?

    If anyone can explain this element (long shot maybe but it really grates at me not knowing - plus hinders my ability to seek answers) I would very much appreciate it.
      My System SpecsSystem Spec


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