Re: Disk Defragmenter
it's recommended you run it once a month...and it only relocates the files on the physical HDD, as in...the files still stay in the folders and such, but the data is moved from place to another in the HDD.
so to answer your questions:
yes, she will still be able to play them, and yes, it does slightly improve performance, especially if you have a large HDD.
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