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Windows 7: Check disk and dismounting

20 Sep 2015   #1

Windows 7 Pro 64 bit
Check disk and dismounting

I wish to run chkdsk q: /r, where q: is a USB drive which has data. The following message appears. Advice about how to proceed would be valued. Also, can a screen shot be put in the middel of a post? TIA.

Attached Thumbnails
Check disk and dismounting-chkdsk.png  
My System SpecsSystem Spec
20 Sep 2015   #2

Windows 7 Ultimate x64 SP1

I guess some file is open. Dismount should be synonym to Safely Remove in this case. Yes or try the command right after Removing and re-plugging.
My System SpecsSystem Spec

 Check disk and dismounting

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