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Date:      Wed, 13 Jun 2012 22:26:16 -0600
From:      Gary Aitken <freebsd@dreamchaser.org>
To:        FreeBSD Mailing List <freebsd-questions@freebsd.org>
Subject:   USB device activity when not mounted
Message-ID:  <4FD967E8.60305@dreamchaser.org>

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I can understand why I would see activity on a USB device when it's first plugged in.  But why do I see continued activity (i.e. the light blinks on a usb disk or memory stick)?  When I umount one of these, they keep being beat up on and it makes me nervous...  At what point is it sync'd and safe to unplug?  I assume when the umount returns, but what's going on after that?

Gary



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