'Scan this Mac' does not scan network shares which are not mounted in /Volumes/.
First seen in Sophos Anti-Virus for Mac OS XSophos Anti-Virus for Mac Home Edition
'Scan this Mac' is designed only to scan local (i.e. not network) volumes. It does not scan network shares which are not mounted in /Volumes/.
The below methods are used for scanning network volumes.
You can scan network shares in any of the following ways:
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