What can cause the automatic release of disk space after deleting a file not to occur?

The release of disk space after deleting a file may not occur automatically for several reasons:

• The file is still open by some process. In operating systems like Linux and Windows, if a file is open, its data remains on the disk until the process closes the handle.
• The file has been removed from the directory, but links to it (hard links) still exist.
• Use of file systems with specific features, such as delayed space release or journaling.
• Caching or deferred deletion in storage systems.

To check if a file is occupied by a process, you can use commands like lsof in Linux or monitoring tools in Windows.