![]() ![]() Sparse Filesįiles which are large but only partially used are called sparse files. In contrast to old file based compression, these files are not flagged as compressed in their file attributes. In Windows 10 Microsoft introduced new transparent compression-features in NTFS, designed to compact the files of the operating system, mainly DLL and EXE files. TreeSize is able to compress and decompress entire file system branches using the context menu. These features can be turned on or off in the Options dialog. Additionally it can show compressed files and folders in a different color. TreeSize is able to show the compression ratio in an extra column on the "Details" tab. As a consequence, for folders that are partially or completely compressed, the allocated space reported by TreeSize may be smaller than the size reported for this folder. The space occupied by a compressed file is usually much smaller than its normal size. The file is compressed again when it is saved. ![]() Decompression happens automatically and transparently during the reading of the file. Files that are compressed on an NTFS volume can be read and written without first being decompressed by another program. NTFS supports compression on an individual file basis. However, TreeSize is able to scan such folders, if you are logged in as administrator or as a user that has the right to perform backups (This option can be changed at "Control Panel > Administrative Tools > Local Security Policy" and with the user editor of Windows). If an administrator tries to access a folder in the Windows Explorer to which the owner denied any other users reading access, an "Access Denied" error message will be displayed. That way one can even deny administrators to access files and folders. One can grant or deny other users or groups certain rights like reading, writing, executing or deleting. The way users can access files and folders can be restricted. We will describe some of these features and their impacts on this software in the following paragraphs. It offers some special features which also have effects for TreeSize. ![]() The file system NTFS can be used with the operating system Windows NT or later. ![]()
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