the file of Mac OS

I read the good article at www.articlecity.info and I reading about Mac OS X File System and File Attributes/ Other file systems have similar file attributes and, in general, offer support for common attributes such as ownership and permissions. However, these attributes can change or even be lost when files are copied using traditional methods. Even when items are copied between Mac OS X systems, file ownership is usually modified to match the account of the user who is performing the operation. When files are transferred to third-party file systems that don’t support all of the attributes of the Mac OS Extended file system, unsupported attributes are simply stripped away. Every file and folder on a Mac OS Extended volume has additional file attributes that are not immediately visible to the user but are an essential part of the file system. These attributes include creation date, modification date, ownership, permissions, access control lists, Spotlight information, Finder labels, and legacy file type information. They also include file system flags, which are used to identify special file types such as aliases and locked files. Some of these attributes are accessed from the Get Info window of the Finder.