The ISO 9660 Specification serves as a fundamental standard in the realm of data storage and file systems. Developed by the International Organization for Standardization (ISO), this specification outlines the structure and organization of CD-ROM (Compact Disc Read-Only Memory) filesystems. It provides guidelines for naming conventions, directory structures, and file attributes, ensuring compatibility across different computer platforms and operating systems. As we explore this topic further, we’ll uncover the intricacies of the ISO 9660 Specification and its significance in the realm of digital data storage and distribution. For more details, please refer to the following article by GIAYCHUNGNHAN.

I. What is ISO 9660 Specification?

ISO 9660 is an international standard established by the International Organization for Standardization (ISO) to define the structure and format of the file system on Compact Disc Read-Only Memory (CD-ROM). This standard specifies rules regarding file names, directory structures, and file attributes on CD-ROM discs, ensuring compatibility across different computer platforms and operating systems. ISO 9660 plays a crucial role in delineating how data is organized on CD-ROM discs to ensure effective access and utilization across a variety of devices and software.

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II. File System Structure

The ISO 9660 file system is divided into two main sections: the primary volume descriptor (PVD) and the data area.

• Primary volume descriptor (PVD): The PVD is located at the beginning of the disc and contains information about the file system, such as the name of the volume, the date and time of creation, and the file system type.
• Data area: The data area is the remainder of the disc and contains the files and directories that are stored on the disc.

III. File Naming Format

The ISO 9660 filename format is a standard format for naming files on optical discs. The filename format consists of a maximum of 8 characters for the file name, followed by a maximum of 3 characters for the file extension.

The file name can be any combination of letters, numbers, and spaces. The file extension can be any combination of letters, numbers, and underscores.

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IV. Extensions

The ISO 9660 file system can be extended using a variety of extensions. These extensions add additional features to the file system, such as support for longer filenames, Unicode filenames, and longer file sizes.

Some common extensions for the ISO 9660 file system include:

• Joliet: Joliet is an extension that supports longer filenames (up to 64 characters) and Unicode filenames.
• Rock Ridge: Rock Ridge is an extension that adds support for long filenames (up to 255 characters), Unicode filenames, and symbolic links.
• UDF: UDF is a newer file system that is designed to replace ISO 9660. UDF supports longer file sizes, more advanced features, and is more efficient than ISO 9660.

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