system
1
I have just run a full system scan.
The statistics at the end showed that Avast had tested 73.1 GB of data . . . . . but when I right-click on my hard-disk and look at it’s properties - it shows only 65.2 GB of it as being used !
How is this possible ? Where is the extra 7.9 GB of data that Avast thinks it has tested ?
I am using Windows XP and have only the one disk and it has only the one partition.
Thank you in advance.
David
Avast is probably counting the data in compressed files/folders in the total.
You’ll probably find that number of files checked is (possibly considerably) greater than number of files on the drive, for the same reason
Larc
4
When scanning files, avast! decompresses compressed files (i.e. zip archives) to check its contents. Since avast! decompresses a compressed file, the size of files scanned increases. 
Eddy
5
You can’t compare used disk size whith total file size(s).
They are two different things.