I have a directory that contains a ton of music that it showing weird file sizes in Windows 10. When I click on the directory containing all the music, it shows 809GB and over 164k files. When I select all the folders and files within that directory to check the sum of their size, it shows only 9.14GB and 2k files. The difference here is staggering.

Though this question is very similar to https://superuser.com/questions/304474/why-dont-the-sizes-of-my-folders-add-up-to-the-size-of-my-hard-drive-in-windows#= it differs in the fact that I am sure I have selected all hidden files, and I double checked the filesize on Linux which confirms that the real filesize of the Music directory is around 9.14GB. I attempted to do the cleanmgr but no change was made to the parent directory's size

enter image description here Note that the Old Music directory in C:\Sorted Drive\Music\Old Music is 809 yet all of the files in C:\Sorted Drive\Music\Old Music\Old Music is only 9.14GB

Update: I've change some folder settings to see if some extra hidden system files weren't showing up when selecting all sub directories and files but there was no change.

I've moved the files to different folders and found that the filesize of the parent directory changes to some random value. Even changing the name of the parent directory can change the filesize

  • tried [ View > Options > View Tab : Tick -> "Show hidden files. folders and drives" & Untick these : "Hide empty dives ", "Hide extensions for known file types ", "Hide folder merge conflicts", "Hide protected operating system files " ] ?
    – p._phidot_
    Oct 18, 2018 at 7:51
  • Why are you comparing F:\Sorted Drive\Music\Old Music with F:\Sorted Drive\Music\Old Music\Old Music ?
    – harrymc
    Oct 18, 2018 at 8:05
  • @p._phidot_ I have show hidden files checked along with showing the file extensions. I’ll try unticking some of the other things you suggested. Wouldn’t those be counted in when checking the disk usage for the folder though? Oct 18, 2018 at 8:12
  • @harrymc the left image is checking “Old Music” in “C:\Sorted Drive\Music\Old Music” while the right image is checking all the folders in “..\Old Music\Old Music” Oct 18, 2018 at 8:16
  • In regard of total disk space, does the number of 809GB seem correct?
    – harrymc
    Oct 18, 2018 at 8:18


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