View All Folder Sizes In Windows Explorer It is best to completely disable it by navigation to "Organize -> Folder and search options -> View" and un-ticking the option "Display file sizes information in folder tips". This feature is enabled by default in Windows 7 and may cause slow-downs especially when browsing network locations. Hovering for example the "c:\windows" folder displays "Size larger than 96.7 MB" which information is absolutely useless. While this option may be good to see the approximate size of a small folder it does not work well for large folders. If you hover a folder with the mouse cursor within few seconds a tooltip will be displayed. View Folder Size In Windows Explorer As Tooltip If the size of a file is a multiple of the size of the sector then it will occupy the last sector completely. Every storage device is divided into sectors in order to improve performance. If you have an audio file for example that is 5 megabytes, loosing 4095 bytes is near to nothing. This may sound as much but the in worst case you loose 4095 bytes per file. This means that if a drive has sector size of 4096 bytes, a 1 byte file will occupy 4096 bytes of physical storage. The difference in size and size on disk is not very big and comes from the fact that the smallest block that a file can occupy is determined by the sector size of the drive. The size on disk is the actual size that the folder occupies on the storage while the size property is its real size. Folder Size In Windows Explorer - Size vs Size On Disk The folder sizes properties window includes both "Size" and "Size on disk" values and also count of files and sub-folders. Good thing though is that the displayed value can be selected and copied to clipboard, but if you want to compare folder sizes and identify largest folders this method is really unpractical. The value that is displayed sometime gets stuck for few seconds before continuing and you do not know if the calculation has completed or not. While that is a good option to view a folder's size, it is a bit annoying that there is no progress bar or notification when the operation is complete. If you right-click a folder and select "properties" Explorer will recursively scan all the files in that folder and its subfolders and progressively display the folder size in the properties dialog while it is summing up the folder and file sizes. The most popular and easy way is to use the "properties" context menu. Though folder sizes are not immediately listed in the Explorer's size column, it provides some features to calculate folder sizes. Folder Size In Windows Explorer Properties Nevertheless the file sizes columns is already in Windows Explorer and Microsoft could make displaying folder sizes there an option in Explorer's settings. This would slow down file operations and also the entire system which is not something that should be sacrificed for a feature that is not crucial. To display the size of folders, Windows Explorer has to read all the file sizes inside the folders in order to calculate their size. There are many reasons why it does not display folder size, but the most significant of all is that such feature will slow down the performance of the file system. Displaying folder sizes in Windows Explorer is something that many users need and find useful, but unfortunately it is not yet fully implemented by Microsoft. Besides its file and folder management features it provides many useful options, but unfortunately it does not display the folder sizes column. It has many essential features for the operation of the entire Windows system. Microsoft's Windows Explorer is the main Windows tool for managing files and folders.
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