Norton Security Full Scan scans ~50% fewer files than NIS 2014

This is on Windows 8.1.1 x64 Professional with Norton Security. 

 

A full scan on Norton Security scans ~50% of files that NIS 2014 full scan did.  NIS 2014 scanned ~1.1 million files whereas Norton Security is scanning/counting ~525,000 files as scanned.  This spans a 240 gigabyte mSATA Intell primary drive which is the C: & G: partitions, a internal 240 gigabyte Intel SSD which is the D: & F: partiitions, an external 240 gigabyte Intel SDD which is the H: and I" parititions, and a WD My Cloud 2 terrabyte drive which is mapped as the P:\ drive. 

 

I have nothing excluded for scanning.  I have "Compress Files Scan" and "Network Drives" scan enabled on Norton Security.