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From: Jolly Roger <jollyroger@pobox.com>
Newsgroups: comp.sys.mac.system
Subject: Re: External HD polling?
Date: 10 Sep 2015 06:03:19 GMT
Organization: People for the Ethical Treatment of Pirates
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On 2015-09-10, Henry <henry999@eircom.net> wrote:
>
> As further information, let me add this: the 'activity' light of the
> external HD has just come on (steady). It is now 7:49. I look at TM
> preferences and find this:
>
> latest backup: today 7:26
> next backup: today 8:25
>
> In addition: both volumes of the external HD have been added to the
> 'Prevent Spotlight from searching these locations' list, so an earlier
> suggested explanation that the disk was spinning up because Spotlight
> was updating its index should be precluded.
>
> So, the mystery remains ... 

If you want to know what is accessing a volume, use the "lsof" command
to list all open files on that volume, like so:

sudo lsof /Volumes/nameofvolume

You need to do this in an OS X account with administrative privileges.

Do this when the drive activity light is lit. 

Feel free to post the output here for help interpreting it.

-- 
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JR