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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: comp.sys.mac.system
Subject: Re: Can't Eject a Volume
Date: 18 Feb 2014 20:13:53 GMT
Organization: People for the Ethical Treatment of Pirates
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On 2014-02-18, Nick Naym <nicknaym@_remove_this_gmail.com.invalid> wrote:
> I have a 2TB WD "My Book Essential" (read that as "cheap piece of crap")
> external drive on which I created two 1TB partitions. Initially, I used
> one simply as a place to store selected (drag & dropped) folders from my
> internal drive; the other for a SuperDuper clone. I got the thing a
> couple of years ago when my previous iMac's HD was failing, simply to
> have an additional (to my TM and clone backups on two external LaCie d2
> Quadras) backup.
>
> Recently, I erased the one that contained the dragged & dropped folders
> and used it to create a second SuperDuper clone.
>
> When I plug the drive in (that's right, there's no on/off switch...you
> turn it on/off by plugging/un[plugging it into the AC), both volumes
> appear on the desktop, and both can be accessed. Oddly, however,
> virtually any time I attempt to unmount/eject the volumes, the one
> containing the second SuperDuper clone refuses to eject: I receive the
> alert "The disk [name of volume] wasn't ejected because one or more
> programs may be using it." Besides Finder, nothing is running, and Disk
> Utility can't find any problems.The only way I can unmount/eject it is
> by force-ejection or by shutting down my iMac and unplugging the drive.
>
> Any ideas? 

Sure. If you want to know which applications have opened files on the
volume in question, this simple terminal command will show you:

lsof /Volumes/[name of volume]

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JR