Linux – Find what is Preventing You from Unmounting a Drive

Disclaimer: I’ve had this problem for probably four months, ever since I started running Plex Media Server on my headless linux machine at home, whilst storing all my actual media on a nice external portable drive. Usually I just yank it, but then I watch the drive letters run themselves up obscenely high before I need to reboot.

So you’ve gone through the process of mounting your drive in Linux:

You run a bunch of stuff, get it all working, then find you need to take the drive to work the next day, so you try to unmount it.

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