Windows Apps Taking a lot of space
Run check disk on your drive... open a command prompt and type
chkdsk c:
Applications can "reserve" disk space for a file, but not fill that file with data.
Also, files can use more space than actual size ... for example if you open a file in notepad and type two letters and save the document, that file is not gonna be 2 bytes, it's gonna be at least 512 bytes. (well, fineprint, technically it will be 0, because windows uses some tricks and stores those 2 bytes in the same area where the file name and the dates and attributes are stored until there's at least something like 50-100 characters in the file, then actual space on disk is reserved and only then at least 512 bytes are given to this file)
So what I'm trying to say is that it's perfectly normal for "size" to be one value and for size on disk to be larger. Size on disk should always be multiples of 512 or 4096 or something like that... the minimum unit that can be reserved for a file on a drive.... but such huge difference is not normal.
You may also have there some system files, which windows explorer can't access to determine the file size (to add on the size line) but it can determine size on disk from information stored in the file system so that could explain some discrepancy.
Check the drive for errors, you start from there and then you see what else
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