Normally, open My Computer, right click the drive letter and select Scan (with your AV) - if it doesn't have context menu entries, you should be able to configure a custom scan of a specific drive from the software's interface.
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New iPad, iPhone SE & Red iPhone 7 on sale now
Synology invites you to visit them at Insomnia on 26th – 29th August. Book your tickets now and visit Synology.