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Windows Defender Full Scan Switches Over To Quick Scan


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#1 zombiewhacker

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Posted 16 March 2016 - 02:29 PM

Hey all.

 

I was running a full scan on my Win8 system using Defender.  After 15 minutes, scan was three-quarters completed with no problems, so  I left the computer for five minutes.  When I returned, Defender had switched over to a Quick Scan in order to finish up. 

 

No threats found, either by Defender or by MBam, which I ran afterwards.  But is it unusual for Defender to switch from Full to Quick scan mid-operations? 



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#2 quietman7

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Posted 16 March 2016 - 05:28 PM

I never heard of that happening before so I'm not sure how it occurred.

There are three types of scans offered by Windows 8/10 Defender and most other anti-virus/anti-malware programs:
  • Quick Scan only checks the areas of your computer most likely to contain malware...the most prevalent and common places where malware typically hides. The length of time for performing a Quick scan will vary but it generally takes about 15-30 minutes so they can be performed daily.
  • Full Scan is much more comprehensive since it scans the entire hard drive (all folders/files) which can number in the thousands. The length of time for performing a Full scan will also vary but because it is so comprehensive, this type of scan can take several hours. Most Full Scans can be scheduled to run late at night when not using the computer so you can perform a weekly scan without having to monitor it.
  • Custom Scan allows the user to select any files and folders on the hard drive to be scanned.
In most cases when performing routine security checks, only a Quick Scan is needed since it checks the areas of your computer most likely to contain malware...the most prevalent and common places where malware typically hides. A Full scan is generally recommended only for heavily infected systems.
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#3 LanceA

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Posted 18 August 2016 - 12:24 PM

This just recently happened to me as well. This is just after Defender discovered a Trojan called Rogue: JS/TechBrolo.A in my Chrome cache in Appdata, but could not remove it because it disappeared after detection.

 

Update: I was just able to make a full scan without interruption. System reported clean.


Edited by LanceA, 18 August 2016 - 02:06 PM.


#4 quietman7

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Posted 18 August 2016 - 03:55 PM

Glad to hear it sorted itself out.
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