If I'm understanding your question Shinto the short answer is no. Lets say you have a folder with 100 videos in it, you have previously scanned it and now scan it again. If all of the files are assigned .nfo files and covers the program will not rescan everythng, Now, lets say one of those files doesn't have a cover assigned to it, Javluv will look, again for a cover. Lets take the folder with 100 files, already scanned, you now add 2 new,unscanned files, if you rescan that folder Javluv willl only try to find .nfo and covers for the 2 New ones. Here's another scenario. You have your 100 files in folder ABC, you move those 100 files, +associated files, to folder JKL, if you now scan JKL folder since you've copied all the files , .nfo and thumb, to the new folder, Javluv will just re-associate those files to the new folder without re-scanning. Now, if you tell the program to regenerate metadata then Javluv will rescan everything in that folder and/or subfolders. My suggestion, play around with a sample set to see what happens but , just as an example, I"ve scanned folders with subfolders, say 2TB of files, Then moved then to an entirely different drive, re-scanned and JavLuv re-associated everything to the new drive in a couple of seconds( I have a pretty fast computer so a couple of seconds may be slightly slower depending.. but ultimately it takes only a very short time for JAVluv to re-associate. I hope that my response is what you're after. Cheers