Full Scan isn't Full

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  • Updated 7 months ago
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When I do a manual, full, scan, it doesn't scan the full computer any more. It used to take almost 3 hours to do a full scan, now it takes barely 5 minutes. I have multiple HDs (ranging from 1 TB to 6 TB) and there is no way it is doing a full scan in 5 min.
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TenrikDarkmane

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Posted 7 months ago

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TM_Kiko, Employee

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Hello TenrikDarkmane ! Welcome to the community!

We understand that you are trying to figure out why the Full Scans only take more or less 5 minutes to finish. We had this discussion last week. Click on this link for the details.

Full Scan not Scanning full 

The Trend Micro Security application will no longer scan the files unless they are modified within 24 hours. 

Rest assured that your computer is safe and secured as the program is also running a Real Time Scan while you are using the computer for your daily activities.

I hope this helps,

Trend Micro Home Users Community
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claudiu_botezatu

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"The Trend Micro Security application will no longer scan the files unless they are modified within 24 hours"

Then the scan shouldn't be named "Full scan" but rather "Smart scan"

I know that if TM performs a "full scan" in 5 minutes seems impressive, but who do you want to fool???

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TM_JB, Official Rep

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Hi claudiu_botezatu,

I get where you are coming from but technically, it is still doing a "Full Scan". Its just that it skips over files that have not been modified recently in order to use less time.

It would be a lot more confusing if it were called "Full Scan but doesn't scan the rest of the unmodified files within 24 hours".

Here is an analogy that might make a bit more sense.

Let's say you were a security guard. The job description includes that you are required to guard and check around 400 locked rooms. Would you check one of those rooms if you saw that the lock wasn't even opened or touched and there were no signs of anyone entering said room? You would probably move on to the next room until you find one that has been touched (modified in our case) right?

That probably wasn't the best analogy but I hope I got the point across.

Here is another similar topic:

Full scan not working correctly 
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claudiu_botezatu

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Hi TM_JB

Here is another analogy: you go for full  car wash , and they will wash only  headlights and mirrors, because the rest of the car seems to be clean.

Would you be happy?


"Smart scan" would be more appropriate , because it is a "smart" idea not to scan unchanged files.

But what if an "unchanged file" is being classified as a malware following a definition update? Will still stay on your computer because is "unchanged" even though the latest definition update would classify it as a malware.

(Edited)
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TM_Jabi, Employee

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Hello claudiu_botezatu

The full scan's function is to check all the files on the computer. But we cannot avoid the files on that same computer to be exposed to threats or possible infections, that's why the full scan, will only check the files that has been modified, or possibly changed within the span of 24 hours are just being scanned again. It's like wiping the dirt that got into your car after having a full car wash, you won't have to wipe or clean the car completely again since you are sure that the remaining parts, aside from what you want to wipe is already clean. 

Regarding the files considered as safe on the succeeding Full scan, we actually have the Real-Time scan to back it up, so if an unchanged file was infected after running the 2nd full scan, the Real-Time scan will do it's job and stop  the infection. 

We can call it Smart or Full Scan, or a Full Smart Scan, I guess. Whatever fits to you or other customers that might be reading this conversation. 

But rest assured that the Trend Micro program is doing it's best to protect you from any infections. 

I hope this helps,

Trend Micro Home Users Community
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claudiu_botezatu

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Hi TM_Jabi,

You did not understand:

Lets say the file "test.exe" with MD5     12345    it is scanned today and found non malicious.

Meanwhile, your researched determined that in fact "test.exe with MD5 12345 it is malicious  and issued a signature update for this detection.

Now, this file will not be scanned again because it is unchanged.

Of course , the real time scan will detect it , but if this is the solution, we can eliminate all types of scans, because ultimately , the real time scan will take care.