Whenever a file is read, windows places a time stamp in the description of the file, which tells you when that file was read/used last time. This feature helps you find a document you know you wrote sometime in September but you can't remember how you named it, for example. When BullGuard scans your computer, the time stamp is changed. The option "Preserve files ‘last access’ timestamp" will prevent BullGuard to change the stamp.
"This feature helps you find a document you know you wrote (it).." No, that's Created.
"It stores the date of when the file was last modified." No, that's Modified.
The third timestamp of the three commonly used is Accessed. Also known as Last Accessed.
From the BG online Help:
Preserve files ‘last access’ timestamp: with this option enabled, BullGuard will not modify the Last Accessed date for the files scanned by the On Access engine. The Last Accessed date is visible in the file’s General tab from the Properties window. If the option is disabled, the Last Accessed date will be changed when the file is scanned by the Antivirus real-time scanner.
Last Accessed has an impact on system, as well as BullGuard, file management and performance.
Here are two links that might aid in further understanding:
If you want to be extremely specific, here is a more correct explanation.
http://en.wikipedia.org/wiki/Timestamp said... A timestamp is the time at which an event is recorded by a computer, not the time of the event itself. In many cases, the difference may be inconsequential: the time at which an event is recorded by a timestamp (e.g., entered into a log file) should be close to the time of the event.
If you right-click on any file on your computer and select Properties, on the General tab you will find the Created, Modified and Accessed timestamps.
Let's take a Word document I created as an example:
I Created it on Friday, July 20, 2012 at 9:24PM The last time it was Modified, was on Monday, October 08, 2012 at 3:39PM The last time it was Accessed was Tuesday, October 30,2012 at 8:49PM
The option "Preserve files ‘last access’ timestamp" will prevent BullGuard to change the Access stamp.
If I open the document and edit it today, both Modified and Accessed will change to today and Created will, of course, remain the same.
Accessed will be the same with Created and Modified if we create a new document today.
I always try to provide simple explanations, that our home users can understand, rather than writing something to prove my own knowledge and skills.
The conclusion is that the computer keeps track of the time a file was used and how and BullGuard can help preserve the last Accessed timestamp. Also, any kind of "on access" activity, means that it is using computer resources and it is slowing the computer down. What my colleague told you by chat is that the Antivirus skips files that it has already checked. This way, in time, the scans will take less and less time to complete.
In hopes that the explanation meets your standards, do not hesitate to contact us whenever you need advice.