The used size of a hard disk that contains only one folder doesn't match exactly the size of the folder,
In the screenshot below, despite the fact that the HD 1 contains only one folder, however, its used space (1.53 TB) doesn’t match exactly the size of the folder (15.4TB).
what could be the issue here?
Your File Explorer is not showing hidden or system folders. If you set it to show hidden files you should see at least one and probably two more folders, 'System Volume Information' and $RECYCLE.BIN. These may hold the 'missing' used space.
First check that your Recycle Bin does not hold any deleted files for the G: drive, if it does then they are currently stored in $RECYCLE.BIN on the G: drive. Emptying the Recycle Bin will remove them.
System Volume Information holds restore points amongst other things, you cannot easily see what's inside it but TreeSize Free run as administrator can. I prefer to use the portable apps version.
TreeSize Free Portable (directory size and usage analyzer) | PortableApps.com
If after all that you still find space is mysteriously being used, then run Chkdisk on the G: drive.
Another possibility is that you do not have read permissions for one or more folders or files in G:\All. File Explorer can only total up the sizes of the files you have permission to see. You may need to tale ownership and grant yourself full permission before you can get the numbers to add up.
I also note from TreeSize that G:\$RECYLE.BIN holds 25GB. If you don't see any such files in your Recycle Bin then they belong to another user, you can only see your own files in your Recycle Bin.
It looks like the contents of this G: drive may have come from another computer. If so, then some of the files/folders belong to other users that do not exist on this PC. If the files in $RECYLE.BIN belong to a user that doesn't exist on this PC then the only way to clear them is to turn off the Recycle Bin for G: by setting G: to permanently delete files immediately, then delete $RECYLE.BIN. An empty $RECYCLE.BIN will be created when you turn it back on.
Set Recycle Bin to Permanently Delete Files Immediately in Windows 10
You have all the tools you need to explore where the differences may be. Have you tried exploring the All folder and its sub-folders in both File Explorer and TreeSize Free? TreeSize says it contains 1.3TB and 612,436 files, while File Explorer says it contains 15.3GB and 8,444 files. It should be fairly easy to spot if you have TreeSize and File Explorer side by side.
Have you run Chkdsk on the drive yet? Space may be incorrectly marked as being 'in use'.
You have not explained where this 'All' folder came from. Was this drive removed from another machine? Is it possible that it contains Junction points?
NTFS junction point - Wikipedia
You may have set it to show hidden files, but Explorer is not showing (in the RH pane) the recycle bin or SVI folders. To show them you need to turn off the option to 'hide protected OS files' under folder options (View>Options). Perhaps the 'All' folder contains similarly protected items? When everything is being shown, other stuff may show up in the 'All' folder, and should then appear in the properties count. HTH, Martin
Many thanks guys for the help,
- The Chkdsk /scan found no errors
- The OS files are visible
- The All folder used to be in the same HD 1 but the observation that they don’t have same size attracted my attention
- I can compare folder by folder, but how to fix if I get difference in size?
The are still not identical size
OK, you are now seeing all 'normal' hidden files, and nothing extra showed up in 'All' - but we still can't see what is inside 'All'. I suspect some weird folders may be lurking, or corrupted files. Expand the 'All folder in explorer, and compare with the same expansion in Treesize (one level will do for now).
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