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From: Morten Bo Johansen <listmail@mbjnet.dk>
Subject: Re: Unmounting usb disk impossible
Date: Wed, 22 Jul 2020 19:58:22 +0200
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On 2020-07-22 Mehmet Erol Sanliturk wrote:

> You did not write your mount statement .

I don't know what it is. It is automounted

> It seems that your umount statement is completely wrong .

> https://www.freebsd.org/cgi/man.cgi?query=umount&sektion=8
> umount
>
> You are saying that
>
> "Unmount ALL of the mounted files in "fstab" .

No, that is not what I am saying. This is from man autofs:

    To unmount all mounted autofs filesystems:
    
           umount -At autofs

That was my command. And as you can see, it actually tries to
unmount the usb disk under /media - which is correct. It just
fails with this "device busy" error. I need to find out which
process is accessing the mount point.

Thanks,
Morten