DavidR
2
First:
- With a resident on-access antivirus like avast, the need for frequent on-demand scans is much depreciated. For the most part the on-demand scan is going to be scanning files that would be otherwise be dormant or inert. If they were active files then the on-access file system shield would be scanning them before being created, modified, opened or executed.
I have avast set to do a scheduled weekly Quick scan, set at a time and day that I know the computer will be on. If for some reason my system wasn’t on, no big deal I will catch up on the next scheduled scan.
In the default Full System Scan not all files are scanned - archives (packers) aren’t scanned (some exceptions, those that are executable), and some file types, commonly files that don’t present a risk and or aren’t targeted, text files and some media files, etc.
Personally I wouldn’t change the default Quick and Full System Scans, that way you know the default settings. Do what you have create a custom scan - but give the scan a Name when you create it otherwise you will get the unnamed scan issue.
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If you use the avastUI > Scan option to open the Scan section, You will see the Quick Scan as the first in line, use the drop down list to access other scans. See image1, a list of my scans I have some custom scans listed.
Once you have selected the scan, click the Settings… text below the Description text. here you can for instance change the Scan Name and Description for your Untitled Scans (rather than delete them) and modify your scan settings. I you want to delete a custom scan that you created there is an option to delete it once you have selected it, image2.
Files that are in the Persistent and Transient cache may not be scanned, there are exceptions for transient, when a new VPS update is received, transient cache is effectively zeroed.
This isn’t an exhaustive list just some examples, but it would make a difference and a note that I too am an avast user like yourself.