When I click NOD32 under Threat Protection Modules I am given the following scan options: Local, Run NOD32, In-Depth Analysis and Diskettes. Local: Scans local disks Run NOD32: Runs an on demand scanner In-depth analysis: Performs an in-depth analysis Diskettes: Scan inserted diskettes Do all the above play a different role? Also with the HDD scanners whats the best one to use, say if I want to do a quick scan for my drives being C and my external USB drive. I've heard that NOD32 has got very fast scanning rate but how do I use this function to activate the fast scanning rate. Say for eg. from the above choices whats the best one to use for a fast scan. Thank you.