text: **7.1.11 Capacity reclamation**
  
  File deletion in modern file systems is realized by updating file system metadata and marking 
  the physical storage space that is used by the removed file as unused. The data of the 
  removed file is not overwritten. This improves file system performance by reducing the 
  number of I/O operations on physical storage required to perform file deletion. 
  
  However, this approach affects the management of real capacity of volumes with enabled 
  capacity savings. File system deletion frees space at the file system level, but physical data 
  blocks that are allocated by the storage for the file still take up the real capacity of a volume. 