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  1.    14 Nov 2017 #11
    Join Date : Jun 2015
    Posts : 2,248
    Windows 10 Home x64 (Laptop), Windows 10 Pro x64 (Desktop)

    Quote Originally Posted by jumanji View Post
    automount Command : Enables or disables the automount feature. When enabled (the default), Windows automatically mounts the file system for a new basic or dynamic volume when it is added to the system, and then assigns a drive letter to the volume.

    As it says, by default automount is enabled in Windows.

    When none of your USB storage devices ( external HDDs, Flash drives) show up in Windows Disk Management (this can happen sometimes) , then we recommend to check whether automount got disabled - somehow. If disabled you have to enable it.

    ( If only one of your external storage device does not show up but others show up with drive letters, there is no need to check automount. That means there is a problem with that storage device. Just to confirm I wanted you to check it on another PC.)

    Actually Steve C should have recommended this:

    Start > All Programs > Accessories > Right click on Command Prompt and Run as administrator.
    diskpart [ENTER]
    Against the DISKPART prompt
    automount [ENTER]
    Does it say "automatic mounting of new volumes disabled " ? Then
    automount enable [ENTER]
    "automatic mounting of new volumes enabled"
    Close Command Window.
    If "automount" command says ""automatic mounting of new volumes enabled" then there is no need to give the "automount enable" command.

    Since you said that three of your external drives are working fine, the above exercise is redundant , but no harm. Sometimes redundancy does help.

    For more insight see this thread where it helped the OP: New Drives Plugged in New Notebook Need to Have Drive Letter Assigned
    I don't agree. I once had one external drive not appearing and automount enable fixed the problem.
      My ComputersSystem Spec
  2.    14 Nov 2017 #12
    Join Date : Mar 2016
    Posts : 319
    Windows 7 Ultimate 32bit

    You may disagree, it is your pleasure.

    Automount is a generic command. It either enables mounting of all USB storage devices or disables mounting of all USB storage devices

    There is no way one can mount enable or mount disable a specific USB storage device.

    "I once had one external drive not appearing and automount enable fixed the problem." I don't believe it. It is my pleasure .
      My ComputerSystem Spec

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