HPOFS volume identifiers can be a maximum of 32 characters and must contain only alphabetic characters (A through Z), numeric characters (0 through 9), a hyphen (-), or a period (.).
The first character of the volume identifier must be alphabetic or numeric and the identifier cannot contain imbedded blanks. Although not required, you can include one or more directories in the path name. Each element of the path can be a maximum of 255 characters with the total maximum path length of 256 characters. A path name can consist of any of the EBCDIC characters except hex 00-3F, hex FF, quotation marks (″), apostrophe (*), greater than symbol (<), less than symbol (>), question mark (?), and slash (\).
The system stores all alphabetic characters for directory and file names to the media in uppercase. File name searches are case-insensitive meaning that you can use either uppercase or lowercase characters to access existing files.
There is no directory and file-level security for high performance optical file system (HPOFS) media. Volume level security is available through authorization lists.
